cc/trees/layer_tree_host_unittest_scroll.cc

   1 // Copyright 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "cc/trees/layer_tree_host.h"
   6
   7 #include "base/location.h"
   8 #include "base/memory/weak_ptr.h"
   9 #include "base/single_thread_task_runner.h"
  10 #include "base/thread_task_runner_handle.h"
  11 #include "cc/layers/layer.h"
  12 #include "cc/layers/layer_impl.h"
  13 #include "cc/layers/picture_layer.h"
  14 #include "cc/scheduler/begin_frame_source.h"
  15 #include "cc/test/fake_content_layer_client.h"
  16 #include "cc/test/fake_layer_tree_host_client.h"
  17 #include "cc/test/fake_picture_layer.h"
  18 #include "cc/test/fake_picture_layer_impl.h"
  19 #include "cc/test/geometry_test_utils.h"
  20 #include "cc/test/layer_tree_test.h"
  21 #include "cc/test/test_shared_bitmap_manager.h"
  22 #include "cc/trees/layer_tree_impl.h"
  23 #include "ui/gfx/geometry/point_conversions.h"
  24 #include "ui/gfx/geometry/size_conversions.h"
  25 #include "ui/gfx/geometry/vector2d_conversions.h"
  26
  27 namespace cc {
  28 namespace {
  29
  30 class LayerTreeHostScrollTest : public LayerTreeTest {};
  31
  32 class LayerTreeHostScrollTestScrollSimple : public LayerTreeHostScrollTest {
  33  public:
  34   LayerTreeHostScrollTestScrollSimple()
  35       : initial_scroll_(10, 20),
  36         second_scroll_(40, 5),
  37         scroll_amount_(2, -1),
  38         num_scrolls_(0) {}
  39
  40   void BeginTest() override {
  41     Layer* root_layer = layer_tree_host()->root_layer();
  42     scoped_refptr<Layer> scroll_layer = Layer::Create(layer_settings());
  43     root_layer->AddChild(scroll_layer);
  44     // Create an effective max_scroll_offset of (100, 100).
  45     scroll_layer->SetBounds(gfx::Size(root_layer->bounds().width() + 100,
  46                                       root_layer->bounds().height() + 100));
  47     scroll_layer->SetIsDrawable(true);
  48     scroll_layer->SetIsContainerForFixedPositionLayers(true);
  49     scroll_layer->SetScrollClipLayerId(root_layer->id());
  50     scroll_layer->SetScrollOffset(initial_scroll_);
  51     layer_tree_host()->RegisterViewportLayers(NULL, root_layer, scroll_layer,
  52                                               NULL);
  53     PostSetNeedsCommitToMainThread();
  54   }
  55
  56   void Layout() override {
  57     Layer* root = layer_tree_host()->root_layer();
  58     Layer* scroll_layer = root->children()[0].get();
  59     if (!layer_tree_host()->source_frame_number()) {
  60       EXPECT_VECTOR_EQ(initial_scroll_, scroll_layer->scroll_offset());
  61     } else {
  62       EXPECT_VECTOR_EQ(gfx::ScrollOffsetWithDelta(initial_scroll_,
  63                                                   scroll_amount_),
  64                        scroll_layer->scroll_offset());
  65
  66       // Pretend like Javascript updated the scroll position itself.
  67       scroll_layer->SetScrollOffset(second_scroll_);
  68     }
  69   }
  70
  71   void DrawLayersOnThread(LayerTreeHostImpl* impl) override {
  72     LayerImpl* root = impl->active_tree()->root_layer();
  73     LayerImpl* scroll_layer = root->children()[0];
  74     EXPECT_VECTOR_EQ(gfx::Vector2d(), scroll_layer->ScrollDelta());
  75
  76     scroll_layer->SetScrollClipLayer(root->id());
  77     scroll_layer->SetBounds(
  78         gfx::Size(root->bounds().width() + 100, root->bounds().height() + 100));
  79     scroll_layer->ScrollBy(scroll_amount_);
  80
  81     switch (impl->active_tree()->source_frame_number()) {
  82       case 0:
  83         EXPECT_VECTOR_EQ(initial_scroll_, scroll_layer->BaseScrollOffset());
  84         EXPECT_VECTOR_EQ(scroll_amount_, scroll_layer->ScrollDelta());
  85         PostSetNeedsCommitToMainThread();
  86         break;
  87       case 1:
  88         EXPECT_VECTOR_EQ(scroll_layer->BaseScrollOffset(), second_scroll_);
  89         EXPECT_VECTOR_EQ(scroll_layer->ScrollDelta(), scroll_amount_);
  90         EndTest();
  91         break;
  92     }
  93   }
  94
  95   void ApplyViewportDeltas(const gfx::Vector2dF& inner_delta,
  96                            const gfx::Vector2dF& outer_delta,
  97                            const gfx::Vector2dF& elastic_overscroll_delta,
  98                            float scale,
  99                            float top_controls_delta) override {
 100     num_scrolls_++;
 101   }
 102
 103   void AfterTest() override { EXPECT_EQ(1, num_scrolls_); }
 104
 105  private:
 106   gfx::ScrollOffset initial_scroll_;
 107   gfx::ScrollOffset second_scroll_;
 108   gfx::Vector2dF scroll_amount_;
 109   int num_scrolls_;
 110 };
 111
 112 MULTI_THREAD_TEST_F(LayerTreeHostScrollTestScrollSimple);
 113
 114 class LayerTreeHostScrollTestScrollMultipleRedraw
 115     : public LayerTreeHostScrollTest {
 116  public:
 117   LayerTreeHostScrollTestScrollMultipleRedraw()
 118       : initial_scroll_(40, 10), scroll_amount_(-3, 17), num_scrolls_(0) {}
 119
 120   void BeginTest() override {
 121     Layer* root_layer = layer_tree_host()->root_layer();
 122     scroll_layer_ = Layer::Create(layer_settings());
 123     root_layer->AddChild(scroll_layer_);
 124     // Create an effective max_scroll_offset of (100, 100).
 125     scroll_layer_->SetBounds(gfx::Size(root_layer->bounds().width() + 100,
 126                                        root_layer->bounds().height() + 100));
 127     scroll_layer_->SetIsDrawable(true);
 128     scroll_layer_->SetIsContainerForFixedPositionLayers(true);
 129     scroll_layer_->SetScrollClipLayerId(root_layer->id());
 130     scroll_layer_->SetScrollOffset(initial_scroll_);
 131     layer_tree_host()->RegisterViewportLayers(NULL, root_layer, scroll_layer_,
 132                                               NULL);
 133     PostSetNeedsCommitToMainThread();
 134   }
 135
 136   void BeginCommitOnThread(LayerTreeHostImpl* impl) override {
 137     switch (layer_tree_host()->source_frame_number()) {
 138       case 0:
 139         EXPECT_VECTOR_EQ(scroll_layer_->scroll_offset(), initial_scroll_);
 140         break;
 141       case 1:
 142         EXPECT_VECTOR_EQ(
 143             scroll_layer_->scroll_offset(),
 144             gfx::ScrollOffsetWithDelta(initial_scroll_,
 145                                        scroll_amount_ + scroll_amount_));
 146       case 2:
 147         EXPECT_VECTOR_EQ(
 148             scroll_layer_->scroll_offset(),
 149             gfx::ScrollOffsetWithDelta(initial_scroll_,
 150                                        scroll_amount_ + scroll_amount_));
 151         break;
 152     }
 153   }
 154
 155   void DrawLayersOnThread(LayerTreeHostImpl* impl) override {
 156     LayerImpl* scroll_layer =
 157         impl->active_tree()->LayerById(scroll_layer_->id());
 158     if (impl->active_tree()->source_frame_number() == 0 &&
 159         impl->SourceAnimationFrameNumber() == 1) {
 160       // First draw after first commit.
 161       EXPECT_VECTOR_EQ(scroll_layer->ScrollDelta(), gfx::Vector2d());
 162       scroll_layer->ScrollBy(scroll_amount_);
 163       EXPECT_VECTOR_EQ(scroll_layer->ScrollDelta(), scroll_amount_);
 164
 165       EXPECT_VECTOR_EQ(scroll_layer->BaseScrollOffset(), initial_scroll_);
 166       PostSetNeedsRedrawToMainThread();
 167     } else if (impl->active_tree()->source_frame_number() == 0 &&
 168                impl->SourceAnimationFrameNumber() == 2) {
 169       // Second draw after first commit.
 170       EXPECT_EQ(scroll_layer->ScrollDelta(), scroll_amount_);
 171       scroll_layer->ScrollBy(scroll_amount_);
 172       EXPECT_VECTOR_EQ(scroll_layer->ScrollDelta(),
 173                        scroll_amount_ + scroll_amount_);
 174
 175       EXPECT_VECTOR_EQ(scroll_layer_->scroll_offset(), initial_scroll_);
 176       PostSetNeedsCommitToMainThread();
 177     } else if (impl->active_tree()->source_frame_number() == 1) {
 178       // Third or later draw after second commit.
 179       EXPECT_GE(impl->SourceAnimationFrameNumber(), 3);
 180       EXPECT_VECTOR_EQ(scroll_layer_->ScrollDelta(), gfx::Vector2d());
 181       EXPECT_VECTOR_EQ(
 182           scroll_layer_->scroll_offset(),
 183           gfx::ScrollOffsetWithDelta(initial_scroll_,
 184                                      scroll_amount_ + scroll_amount_));
 185       EndTest();
 186     }
 187   }
 188
 189   void ApplyViewportDeltas(const gfx::Vector2dF& inner_delta,
 190                            const gfx::Vector2dF& outer_delta,
 191                            const gfx::Vector2dF& elastic_overscroll_delta,
 192                            float scale,
 193                            float top_controls_delta) override {
 194     num_scrolls_++;
 195   }
 196
 197   void AfterTest() override { EXPECT_EQ(1, num_scrolls_); }
 198
 199  private:
 200   gfx::ScrollOffset initial_scroll_;
 201   gfx::Vector2dF scroll_amount_;
 202   int num_scrolls_;
 203   scoped_refptr<Layer> scroll_layer_;
 204 };
 205
 206 MULTI_THREAD_TEST_F(LayerTreeHostScrollTestScrollMultipleRedraw);
 207
 208 class LayerTreeHostScrollTestScrollAbortedCommit
 209     : public LayerTreeHostScrollTest {
 210  public:
 211   LayerTreeHostScrollTestScrollAbortedCommit()
 212       : initial_scroll_(50, 60),
 213         impl_scroll_(-3, 2),
 214         second_main_scroll_(14, -3),
 215         impl_scale_(2.f),
 216         num_will_begin_main_frames_(0),
 217         num_did_begin_main_frames_(0),
 218         num_will_commits_(0),
 219         num_did_commits_(0),
 220         num_impl_commits_(0),
 221         num_impl_scrolls_(0) {}
 222
 223   void BeginTest() override { PostSetNeedsCommitToMainThread(); }
 224
 225   void SetupTree() override {
 226     LayerTreeHostScrollTest::SetupTree();
 227     Layer* root_layer = layer_tree_host()->root_layer();
 228     scoped_refptr<Layer> root_scroll_layer = Layer::Create(layer_settings());
 229     root_scroll_layer->SetScrollClipLayerId(root_layer->id());
 230     root_scroll_layer->SetScrollOffset(initial_scroll_);
 231     root_scroll_layer->SetBounds(gfx::Size(200, 200));
 232     root_scroll_layer->SetIsDrawable(true);
 233     root_scroll_layer->SetIsContainerForFixedPositionLayers(true);
 234     root_layer->AddChild(root_scroll_layer);
 235
 236     layer_tree_host()->RegisterViewportLayers(NULL, root_layer,
 237                                               root_scroll_layer, NULL);
 238     layer_tree_host()->SetPageScaleFactorAndLimits(1.f, 0.01f, 100.f);
 239   }
 240
 241   void WillBeginMainFrame() override {
 242     num_will_begin_main_frames_++;
 243     Layer* root_scroll_layer =
 244         layer_tree_host()->root_layer()->children()[0].get();
 245     switch (num_will_begin_main_frames_) {
 246       case 1:
 247         // This will not be aborted because of the initial prop changes.
 248         EXPECT_EQ(0, num_impl_scrolls_);
 249         EXPECT_EQ(0, layer_tree_host()->source_frame_number());
 250         EXPECT_VECTOR_EQ(root_scroll_layer->scroll_offset(), initial_scroll_);
 251         EXPECT_EQ(1.f, layer_tree_host()->page_scale_factor());
 252         break;
 253       case 2:
 254         // This commit will be aborted, and another commit will be
 255         // initiated from the redraw.
 256         EXPECT_EQ(1, num_impl_scrolls_);
 257         EXPECT_EQ(1, layer_tree_host()->source_frame_number());
 258         EXPECT_VECTOR_EQ(
 259             root_scroll_layer->scroll_offset(),
 260             gfx::ScrollOffsetWithDelta(initial_scroll_, impl_scroll_));
 261         EXPECT_EQ(impl_scale_, layer_tree_host()->page_scale_factor());
 262         PostSetNeedsRedrawToMainThread();
 263         break;
 264       case 3:
 265         // This commit will not be aborted because of the scroll change.
 266         EXPECT_EQ(2, num_impl_scrolls_);
 267         // The source frame number still increases even with the abort.
 268         EXPECT_EQ(2, layer_tree_host()->source_frame_number());
 269         EXPECT_VECTOR_EQ(
 270             root_scroll_layer->scroll_offset(),
 271             gfx::ScrollOffsetWithDelta(initial_scroll_,
 272                                        impl_scroll_ + impl_scroll_));
 273         EXPECT_EQ(impl_scale_ * impl_scale_,
 274                   layer_tree_host()->page_scale_factor());
 275         root_scroll_layer->SetScrollOffset(gfx::ScrollOffsetWithDelta(
 276             root_scroll_layer->scroll_offset(), second_main_scroll_));
 277         break;
 278       case 4:
 279         // This commit will also be aborted.
 280         EXPECT_EQ(3, num_impl_scrolls_);
 281         EXPECT_EQ(3, layer_tree_host()->source_frame_number());
 282         gfx::Vector2dF delta =
 283             impl_scroll_ + impl_scroll_ + impl_scroll_ + second_main_scroll_;
 284         EXPECT_VECTOR_EQ(root_scroll_layer->scroll_offset(),
 285                          gfx::ScrollOffsetWithDelta(initial_scroll_, delta));
 286
 287         // End the test by drawing to verify this commit is also aborted.
 288         PostSetNeedsRedrawToMainThread();
 289         break;
 290     }
 291   }
 292
 293   void DidBeginMainFrame() override { num_did_begin_main_frames_++; }
 294
 295   void WillCommit() override { num_will_commits_++; }
 296
 297   void DidCommit() override { num_did_commits_++; }
 298
 299   void BeginCommitOnThread(LayerTreeHostImpl* impl) override {
 300     num_impl_commits_++;
 301   }
 302
 303   void DrawLayersOnThread(LayerTreeHostImpl* impl) override {
 304     LayerImpl* root_scroll_layer =
 305         impl->active_tree()->root_layer()->children()[0];
 306
 307     if (impl->active_tree()->source_frame_number() == 0 &&
 308         impl->SourceAnimationFrameNumber() == 1) {
 309       // First draw
 310       EXPECT_VECTOR_EQ(root_scroll_layer->ScrollDelta(), gfx::Vector2d());
 311       root_scroll_layer->ScrollBy(impl_scroll_);
 312       EXPECT_VECTOR_EQ(root_scroll_layer->ScrollDelta(), impl_scroll_);
 313       EXPECT_VECTOR_EQ(root_scroll_layer->BaseScrollOffset(), initial_scroll_);
 314
 315       EXPECT_EQ(1.f, impl->active_tree()->page_scale_delta());
 316       EXPECT_EQ(1.f, impl->active_tree()->current_page_scale_factor());
 317       impl->SetPageScaleOnActiveTree(impl_scale_);
 318       EXPECT_EQ(impl_scale_, impl->active_tree()->page_scale_delta());
 319       EXPECT_EQ(impl_scale_, impl->active_tree()->current_page_scale_factor());
 320
 321       // To simplify the testing flow, don't redraw here, just commit.
 322       impl->SetNeedsCommit();
 323     } else if (impl->active_tree()->source_frame_number() == 0 &&
 324                impl->SourceAnimationFrameNumber() == 2) {
 325       // Test a second draw after an aborted commit.
 326       // The scroll/scale values should be baked into the offset/scale factor
 327       // since the main thread consumed but aborted the begin frame.
 328       EXPECT_VECTOR_EQ(root_scroll_layer->ScrollDelta(), gfx::Vector2d());
 329       root_scroll_layer->ScrollBy(impl_scroll_);
 330       EXPECT_VECTOR_EQ(root_scroll_layer->ScrollDelta(), impl_scroll_);
 331       EXPECT_VECTOR_EQ(
 332           root_scroll_layer->BaseScrollOffset(),
 333           gfx::ScrollOffsetWithDelta(initial_scroll_, impl_scroll_));
 334
 335       EXPECT_EQ(1.f, impl->active_tree()->page_scale_delta());
 336       EXPECT_EQ(impl_scale_, impl->active_tree()->current_page_scale_factor());
 337       impl->SetPageScaleOnActiveTree(impl_scale_ * impl_scale_);
 338       EXPECT_EQ(impl_scale_, impl->active_tree()->page_scale_delta());
 339       EXPECT_EQ(impl_scale_ * impl_scale_,
 340                 impl->active_tree()->current_page_scale_factor());
 341
 342       impl->SetNeedsCommit();
 343     } else if (impl->active_tree()->source_frame_number() == 1) {
 344       // Commit for source frame 1 is aborted.
 345       NOTREACHED();
 346     } else if (impl->active_tree()->source_frame_number() == 2 &&
 347                impl->SourceAnimationFrameNumber() == 3) {
 348       // Third draw after the second full commit.
 349       EXPECT_EQ(root_scroll_layer->ScrollDelta(), gfx::Vector2d());
 350       root_scroll_layer->ScrollBy(impl_scroll_);
 351       impl->SetNeedsCommit();
 352       EXPECT_VECTOR_EQ(root_scroll_layer->ScrollDelta(), impl_scroll_);
 353       gfx::Vector2dF delta = impl_scroll_ + impl_scroll_ + second_main_scroll_;
 354       EXPECT_VECTOR_EQ(root_scroll_layer->BaseScrollOffset(),
 355                        gfx::ScrollOffsetWithDelta(initial_scroll_, delta));
 356     } else if (impl->active_tree()->source_frame_number() == 2 &&
 357                impl->SourceAnimationFrameNumber() == 4) {
 358       // Final draw after the second aborted commit.
 359       EXPECT_VECTOR_EQ(root_scroll_layer->ScrollDelta(), gfx::Vector2d());
 360       gfx::Vector2dF delta =
 361           impl_scroll_ + impl_scroll_ + impl_scroll_ + second_main_scroll_;
 362       EXPECT_VECTOR_EQ(root_scroll_layer->BaseScrollOffset(),
 363                        gfx::ScrollOffsetWithDelta(initial_scroll_, delta));
 364       EndTest();
 365     } else {
 366       // Commit for source frame 3 is aborted.
 367       NOTREACHED();
 368     }
 369   }
 370
 371   void ApplyViewportDeltas(const gfx::Vector2dF& inner_delta,
 372                            const gfx::Vector2dF& outer_delta,
 373                            const gfx::Vector2dF& elastic_overscroll_delta,
 374                            float scale,
 375                            float top_controls_delta) override {
 376     num_impl_scrolls_++;
 377   }
 378
 379   void AfterTest() override {
 380     EXPECT_EQ(3, num_impl_scrolls_);
 381     // Verify that the embedder sees aborted commits as real commits.
 382     EXPECT_EQ(4, num_will_begin_main_frames_);
 383     EXPECT_EQ(4, num_did_begin_main_frames_);
 384     EXPECT_EQ(4, num_will_commits_);
 385     EXPECT_EQ(4, num_did_commits_);
 386     // ...but the compositor thread only sees two real ones.
 387     EXPECT_EQ(2, num_impl_commits_);
 388   }
 389
 390  private:
 391   gfx::ScrollOffset initial_scroll_;
 392   gfx::Vector2dF impl_scroll_;
 393   gfx::Vector2dF second_main_scroll_;
 394   float impl_scale_;
 395   int num_will_begin_main_frames_;
 396   int num_did_begin_main_frames_;
 397   int num_will_commits_;
 398   int num_did_commits_;
 399   int num_impl_commits_;
 400   int num_impl_scrolls_;
 401 };
 402
 403 MULTI_THREAD_TEST_F(LayerTreeHostScrollTestScrollAbortedCommit);
 404
 405 class LayerTreeHostScrollTestFractionalScroll : public LayerTreeHostScrollTest {
 406  public:
 407   LayerTreeHostScrollTestFractionalScroll() : scroll_amount_(1.75, 0) {}
 408
 409   void SetupTree() override {
 410     LayerTreeHostScrollTest::SetupTree();
 411     Layer* root_layer = layer_tree_host()->root_layer();
 412     scoped_refptr<Layer> root_scroll_layer = Layer::Create(layer_settings());
 413     root_scroll_layer->SetScrollClipLayerId(root_layer->id());
 414     root_scroll_layer->SetBounds(
 415         gfx::Size(root_layer->bounds().width() + 100,
 416                   root_layer->bounds().height() + 100));
 417     root_scroll_layer->SetIsDrawable(true);
 418     root_scroll_layer->SetIsContainerForFixedPositionLayers(true);
 419     root_layer->AddChild(root_scroll_layer);
 420
 421     layer_tree_host()->RegisterViewportLayers(NULL, root_layer,
 422                                               root_scroll_layer, NULL);
 423     layer_tree_host()->SetPageScaleFactorAndLimits(1.f, 0.01f, 100.f);
 424   }
 425
 426   void BeginTest() override { PostSetNeedsCommitToMainThread(); }
 427
 428   void DrawLayersOnThread(LayerTreeHostImpl* impl) override {
 429     LayerImpl* root = impl->active_tree()->root_layer();
 430     LayerImpl* scroll_layer = root->children()[0];
 431
 432     // Check that a fractional scroll delta is correctly accumulated over
 433     // multiple commits.
 434     switch (impl->active_tree()->source_frame_number()) {
 435       case 0:
 436         EXPECT_VECTOR_EQ(scroll_layer->BaseScrollOffset(), gfx::Vector2d(0, 0));
 437         EXPECT_VECTOR_EQ(scroll_layer->ScrollDelta(), gfx::Vector2d(0, 0));
 438         PostSetNeedsCommitToMainThread();
 439         break;
 440       case 1:
 441         EXPECT_VECTOR_EQ(scroll_layer->BaseScrollOffset(),
 442                          gfx::ToFlooredVector2d(scroll_amount_));
 443         EXPECT_VECTOR_EQ(scroll_layer->ScrollDelta(),
 444                          gfx::Vector2dF(fmod(scroll_amount_.x(), 1.0f), 0.0f));
 445         PostSetNeedsCommitToMainThread();
 446         break;
 447       case 2:
 448         EXPECT_VECTOR_EQ(
 449             scroll_layer->BaseScrollOffset(),
 450             gfx::ToFlooredVector2d(scroll_amount_ + scroll_amount_));
 451         EXPECT_VECTOR_EQ(
 452             scroll_layer->ScrollDelta(),
 453             gfx::Vector2dF(fmod(2.0f * scroll_amount_.x(), 1.0f), 0.0f));
 454         EndTest();
 455         break;
 456     }
 457     scroll_layer->ScrollBy(scroll_amount_);
 458   }
 459
 460   void AfterTest() override {}
 461
 462  private:
 463   gfx::Vector2dF scroll_amount_;
 464 };
 465
 466 MULTI_THREAD_TEST_F(LayerTreeHostScrollTestFractionalScroll);
 467
 468 class LayerTreeHostScrollTestCaseWithChild : public LayerTreeHostScrollTest {
 469  public:
 470   LayerTreeHostScrollTestCaseWithChild()
 471       : initial_offset_(10, 20),
 472         javascript_scroll_(40, 5),
 473         scroll_amount_(2, -1),
 474         num_scrolls_(0) {}
 475
 476   void SetupTree() override {
 477     layer_tree_host()->SetDeviceScaleFactor(device_scale_factor_);
 478
 479     scoped_refptr<Layer> root_layer = Layer::Create(layer_settings());
 480     root_layer->SetBounds(gfx::Size(10, 10));
 481
 482     root_scroll_layer_ =
 483         FakePictureLayer::Create(layer_settings(), &fake_content_layer_client_);
 484     root_scroll_layer_->SetBounds(gfx::Size(110, 110));
 485
 486     root_scroll_layer_->SetPosition(gfx::Point());
 487
 488     root_scroll_layer_->SetIsDrawable(true);
 489     root_scroll_layer_->SetScrollClipLayerId(root_layer->id());
 490     root_scroll_layer_->SetIsContainerForFixedPositionLayers(true);
 491     root_layer->AddChild(root_scroll_layer_);
 492
 493     child_layer_ =
 494         FakePictureLayer::Create(layer_settings(), &fake_content_layer_client_);
 495     child_layer_->set_did_scroll_callback(
 496         base::Bind(&LayerTreeHostScrollTestCaseWithChild::DidScroll,
 497                    base::Unretained(this)));
 498     child_layer_->SetBounds(gfx::Size(110, 110));
 499
 500     if (scroll_child_layer_) {
 501       // Scrolls on the child layer will happen at 5, 5. If they are treated
 502       // like device pixels, and device scale factor is 2, then they will
 503       // be considered at 2.5, 2.5 in logical pixels, and will miss this layer.
 504       child_layer_->SetPosition(gfx::Point(5, 5));
 505     } else {
 506       // Adjust the child layer horizontally so that scrolls will never hit it.
 507       child_layer_->SetPosition(gfx::Point(60, 5));
 508     }
 509
 510     child_layer_->SetIsDrawable(true);
 511     child_layer_->SetScrollClipLayerId(root_layer->id());
 512     child_layer_->SetBounds(root_scroll_layer_->bounds());
 513     root_scroll_layer_->AddChild(child_layer_);
 514
 515     if (scroll_child_layer_) {
 516       expected_scroll_layer_ = child_layer_;
 517       expected_no_scroll_layer_ = root_scroll_layer_;
 518     } else {
 519       expected_scroll_layer_ = root_scroll_layer_;
 520       expected_no_scroll_layer_ = child_layer_;
 521     }
 522
 523     expected_scroll_layer_->SetScrollOffset(initial_offset_);
 524
 525     layer_tree_host()->SetRootLayer(root_layer);
 526     layer_tree_host()->RegisterViewportLayers(NULL, root_layer,
 527                                               root_scroll_layer_, NULL);
 528     LayerTreeHostScrollTest::SetupTree();
 529   }
 530
 531   void BeginTest() override { PostSetNeedsCommitToMainThread(); }
 532
 533   void WillCommit() override {
 534     // Keep the test committing (otherwise the early out for no update
 535     // will stall the test).
 536     if (layer_tree_host()->source_frame_number() < 2) {
 537       layer_tree_host()->SetNeedsCommit();
 538     }
 539   }
 540
 541   void DidScroll() {
 542     final_scroll_offset_ = expected_scroll_layer_->scroll_offset();
 543   }
 544
 545   void ApplyViewportDeltas(const gfx::Vector2dF& inner_delta,
 546                            const gfx::Vector2dF& outer_delta,
 547                            const gfx::Vector2dF& elastic_overscroll_delta,
 548                            float scale,
 549                            float top_controls_delta) override {
 550     num_scrolls_++;
 551   }
 552
 553   void Layout() override {
 554     EXPECT_VECTOR_EQ(gfx::Vector2d(),
 555                      expected_no_scroll_layer_->scroll_offset());
 556
 557     switch (layer_tree_host()->source_frame_number()) {
 558       case 0:
 559         EXPECT_VECTOR_EQ(initial_offset_,
 560                          expected_scroll_layer_->scroll_offset());
 561         break;
 562       case 1:
 563         EXPECT_VECTOR_EQ(
 564             gfx::ScrollOffsetWithDelta(initial_offset_, scroll_amount_),
 565             expected_scroll_layer_->scroll_offset());
 566
 567         // Pretend like Javascript updated the scroll position itself.
 568         expected_scroll_layer_->SetScrollOffset(javascript_scroll_);
 569         break;
 570       case 2:
 571         EXPECT_VECTOR_EQ(gfx::ScrollOffsetWithDelta(javascript_scroll_,
 572                                                     scroll_amount_),
 573                          expected_scroll_layer_->scroll_offset());
 574         break;
 575     }
 576   }
 577
 578   void DidActivateTreeOnThread(LayerTreeHostImpl* impl) override {
 579     LayerImpl* root_impl = impl->active_tree()->root_layer();
 580     FakePictureLayerImpl* root_scroll_layer_impl =
 581         static_cast<FakePictureLayerImpl*>(root_impl->children()[0]);
 582     FakePictureLayerImpl* child_layer_impl = static_cast<FakePictureLayerImpl*>(
 583         root_scroll_layer_impl->children()[0]);
 584
 585     LayerImpl* expected_scroll_layer_impl = NULL;
 586     LayerImpl* expected_no_scroll_layer_impl = NULL;
 587     if (scroll_child_layer_) {
 588       expected_scroll_layer_impl = child_layer_impl;
 589       expected_no_scroll_layer_impl = root_scroll_layer_impl;
 590     } else {
 591       expected_scroll_layer_impl = root_scroll_layer_impl;
 592       expected_no_scroll_layer_impl = child_layer_impl;
 593     }
 594
 595     EXPECT_VECTOR_EQ(gfx::Vector2d(), root_impl->ScrollDelta());
 596     EXPECT_VECTOR_EQ(gfx::Vector2d(),
 597                      expected_no_scroll_layer_impl->ScrollDelta());
 598
 599     // Ensure device scale factor matches the active tree.
 600     EXPECT_EQ(device_scale_factor_, impl->active_tree()->device_scale_factor());
 601     switch (impl->active_tree()->source_frame_number()) {
 602       case 0: {
 603         // GESTURE scroll on impl thread.
 604         InputHandler::ScrollStatus status = impl->ScrollBegin(
 605             gfx::ToCeiledPoint(expected_scroll_layer_impl->position() -
 606                                gfx::Vector2dF(0.5f, 0.5f)),
 607             InputHandler::GESTURE);
 608         EXPECT_EQ(InputHandler::SCROLL_STARTED, status);
 609         impl->ScrollBy(gfx::Point(), scroll_amount_);
 610         impl->ScrollEnd();
 611
 612         // Check the scroll is applied as a delta.
 613         EXPECT_VECTOR_EQ(initial_offset_,
 614                          expected_scroll_layer_impl->BaseScrollOffset());
 615         EXPECT_VECTOR_EQ(scroll_amount_,
 616                          expected_scroll_layer_impl->ScrollDelta());
 617         break;
 618       }
 619       case 1: {
 620         // WHEEL scroll on impl thread.
 621         InputHandler::ScrollStatus status = impl->ScrollBegin(
 622             gfx::ToCeiledPoint(expected_scroll_layer_impl->position() +
 623                                gfx::Vector2dF(0.5f, 0.5f)),
 624             InputHandler::WHEEL);
 625         EXPECT_EQ(InputHandler::SCROLL_STARTED, status);
 626         impl->ScrollBy(gfx::Point(), scroll_amount_);
 627         impl->ScrollEnd();
 628
 629         // Check the scroll is applied as a delta.
 630         EXPECT_VECTOR_EQ(javascript_scroll_,
 631                          expected_scroll_layer_impl->BaseScrollOffset());
 632         EXPECT_VECTOR_EQ(scroll_amount_,
 633                          expected_scroll_layer_impl->ScrollDelta());
 634         break;
 635       }
 636       case 2:
 637
 638         EXPECT_VECTOR_EQ(
 639             gfx::ScrollOffsetWithDelta(javascript_scroll_, scroll_amount_),
 640             expected_scroll_layer_impl->BaseScrollOffset());
 641         EXPECT_VECTOR_EQ(gfx::Vector2d(),
 642                          expected_scroll_layer_impl->ScrollDelta());
 643
 644         EndTest();
 645         break;
 646     }
 647   }
 648
 649   void AfterTest() override {
 650     if (scroll_child_layer_) {
 651       EXPECT_EQ(0, num_scrolls_);
 652       EXPECT_VECTOR_EQ(gfx::ScrollOffsetWithDelta(javascript_scroll_,
 653                                                   scroll_amount_),
 654                        final_scroll_offset_);
 655     } else {
 656       EXPECT_EQ(2, num_scrolls_);
 657       EXPECT_VECTOR_EQ(gfx::ScrollOffset(), final_scroll_offset_);
 658     }
 659   }
 660
 661  protected:
 662   float device_scale_factor_;
 663   bool scroll_child_layer_;
 664
 665   gfx::ScrollOffset initial_offset_;
 666   gfx::ScrollOffset javascript_scroll_;
 667   gfx::Vector2d scroll_amount_;
 668   int num_scrolls_;
 669   gfx::ScrollOffset final_scroll_offset_;
 670
 671   FakeContentLayerClient fake_content_layer_client_;
 672
 673   scoped_refptr<Layer> root_scroll_layer_;
 674   scoped_refptr<Layer> child_layer_;
 675   scoped_refptr<Layer> expected_scroll_layer_;
 676   scoped_refptr<Layer> expected_no_scroll_layer_;
 677 };
 678
 679 TEST_F(LayerTreeHostScrollTestCaseWithChild,
 680        DeviceScaleFactor1_ScrollChild_DirectRenderer) {
 681   device_scale_factor_ = 1.f;
 682   scroll_child_layer_ = true;
 683   RunTest(true, false, true);
 684 }
 685
 686 TEST_F(LayerTreeHostScrollTestCaseWithChild,
 687        DeviceScaleFactor1_ScrollChild_DelegatingRenderer) {
 688   device_scale_factor_ = 1.f;
 689   scroll_child_layer_ = true;
 690   RunTest(true, true, true);
 691 }
 692
 693 TEST_F(LayerTreeHostScrollTestCaseWithChild,
 694        DeviceScaleFactor15_ScrollChild_DirectRenderer) {
 695   device_scale_factor_ = 1.5f;
 696   scroll_child_layer_ = true;
 697   RunTest(true, false, true);
 698 }
 699
 700 TEST_F(LayerTreeHostScrollTestCaseWithChild,
 701        DeviceScaleFactor15_ScrollChild_DelegatingRenderer) {
 702   device_scale_factor_ = 1.5f;
 703   scroll_child_layer_ = true;
 704   RunTest(true, true, true);
 705 }
 706
 707 TEST_F(LayerTreeHostScrollTestCaseWithChild,
 708        DeviceScaleFactor2_ScrollChild_DirectRenderer) {
 709   device_scale_factor_ = 2.f;
 710   scroll_child_layer_ = true;
 711   RunTest(true, false, true);
 712 }
 713
 714 TEST_F(LayerTreeHostScrollTestCaseWithChild,
 715        DeviceScaleFactor2_ScrollChild_DelegatingRenderer) {
 716   device_scale_factor_ = 2.f;
 717   scroll_child_layer_ = true;
 718   RunTest(true, true, true);
 719 }
 720
 721 TEST_F(LayerTreeHostScrollTestCaseWithChild,
 722        DeviceScaleFactor1_ScrollRootScrollLayer_DirectRenderer) {
 723   device_scale_factor_ = 1.f;
 724   scroll_child_layer_ = false;
 725   RunTest(true, false, true);
 726 }
 727
 728 TEST_F(LayerTreeHostScrollTestCaseWithChild,
 729        DeviceScaleFactor1_ScrollRootScrollLayer_DelegatingRenderer) {
 730   device_scale_factor_ = 1.f;
 731   scroll_child_layer_ = false;
 732   RunTest(true, true, true);
 733 }
 734
 735 TEST_F(LayerTreeHostScrollTestCaseWithChild,
 736        DeviceScaleFactor15_ScrollRootScrollLayer_DirectRenderer) {
 737   device_scale_factor_ = 1.5f;
 738   scroll_child_layer_ = false;
 739   RunTest(true, false, true);
 740 }
 741
 742 TEST_F(LayerTreeHostScrollTestCaseWithChild,
 743        DeviceScaleFactor15_ScrollRootScrollLayer_DelegatingRenderer) {
 744   device_scale_factor_ = 1.5f;
 745   scroll_child_layer_ = false;
 746   RunTest(true, true, true);
 747 }
 748
 749 TEST_F(LayerTreeHostScrollTestCaseWithChild,
 750        DeviceScaleFactor2_ScrollRootScrollLayer_DirectRenderer) {
 751   device_scale_factor_ = 2.f;
 752   scroll_child_layer_ = false;
 753   RunTest(true, false, true);
 754 }
 755
 756 TEST_F(LayerTreeHostScrollTestCaseWithChild,
 757        DeviceScaleFactor2_ScrollRootScrollLayer_DelegatingRenderer) {
 758   device_scale_factor_ = 2.f;
 759   scroll_child_layer_ = false;
 760   RunTest(true, true, true);
 761 }
 762
 763 class ImplSidePaintingScrollTest : public LayerTreeHostScrollTest {
 764  public:
 765   void InitializeSettings(LayerTreeSettings* settings) override {
 766     settings->impl_side_painting = true;
 767   }
 768
 769   void DrawLayersOnThread(LayerTreeHostImpl* impl) override {
 770     if (impl->pending_tree())
 771       impl->SetNeedsRedraw();
 772   }
 773 };
 774
 775 class ImplSidePaintingScrollTestSimple : public ImplSidePaintingScrollTest {
 776  public:
 777   ImplSidePaintingScrollTestSimple()
 778       : initial_scroll_(10, 20),
 779         main_thread_scroll_(40, 5),
 780         impl_thread_scroll1_(2, -1),
 781         impl_thread_scroll2_(-3, 10),
 782         num_scrolls_(0) {}
 783
 784   void SetupTree() override {
 785     LayerTreeHostScrollTest::SetupTree();
 786     Layer* root_layer = layer_tree_host()->root_layer();
 787     scoped_refptr<Layer> root_scroll_layer = Layer::Create(layer_settings());
 788     root_scroll_layer->SetScrollClipLayerId(root_layer->id());
 789     root_scroll_layer->SetScrollOffset(initial_scroll_);
 790     root_scroll_layer->SetBounds(
 791         gfx::Size(root_layer->bounds().width() + 100,
 792                   root_layer->bounds().height() + 100));
 793     root_scroll_layer->SetIsDrawable(true);
 794     root_scroll_layer->SetIsContainerForFixedPositionLayers(true);
 795     root_layer->AddChild(root_scroll_layer);
 796
 797     layer_tree_host()->RegisterViewportLayers(NULL, root_layer,
 798                                               root_scroll_layer, NULL);
 799     layer_tree_host()->SetPageScaleFactorAndLimits(1.f, 0.01f, 100.f);
 800   }
 801
 802   void BeginTest() override { PostSetNeedsCommitToMainThread(); }
 803
 804   void Layout() override {
 805     Layer* root = layer_tree_host()->root_layer();
 806     Layer* scroll_layer = root->children()[0].get();
 807     if (!layer_tree_host()->source_frame_number()) {
 808       EXPECT_VECTOR_EQ(scroll_layer->scroll_offset(), initial_scroll_);
 809     } else {
 810       EXPECT_VECTOR_EQ(
 811           scroll_layer->scroll_offset(),
 812           gfx::ScrollOffsetWithDelta(initial_scroll_, impl_thread_scroll1_));
 813
 814       // Pretend like Javascript updated the scroll position itself with a
 815       // change of main_thread_scroll.
 816       scroll_layer->SetScrollOffset(
 817           gfx::ScrollOffsetWithDelta(
 818               initial_scroll_, main_thread_scroll_ + impl_thread_scroll1_));
 819     }
 820   }
 821
 822   void CommitCompleteOnThread(LayerTreeHostImpl* impl) override {
 823     // We force a second draw here of the first commit before activating
 824     // the second commit.
 825     if (impl->active_tree()->source_frame_number() == 0)
 826       impl->SetNeedsRedraw();
 827   }
 828
 829   void DrawLayersOnThread(LayerTreeHostImpl* impl) override {
 830     ImplSidePaintingScrollTest::DrawLayersOnThread(impl);
 831
 832     LayerImpl* root = impl->active_tree()->root_layer();
 833     LayerImpl* scroll_layer = root->children()[0];
 834     LayerImpl* pending_root =
 835         impl->active_tree()->FindPendingTreeLayerById(root->id());
 836
 837     switch (impl->active_tree()->source_frame_number()) {
 838       case 0:
 839         if (!impl->pending_tree()) {
 840           impl->BlockNotifyReadyToActivateForTesting(true);
 841           EXPECT_VECTOR_EQ(scroll_layer->ScrollDelta(), gfx::Vector2d());
 842           scroll_layer->ScrollBy(impl_thread_scroll1_);
 843
 844           EXPECT_VECTOR_EQ(scroll_layer->BaseScrollOffset(), initial_scroll_);
 845           EXPECT_VECTOR_EQ(scroll_layer->ScrollDelta(), impl_thread_scroll1_);
 846           PostSetNeedsCommitToMainThread();
 847
 848           // CommitCompleteOnThread will trigger this function again
 849           // and cause us to take the else clause.
 850         } else {
 851           impl->BlockNotifyReadyToActivateForTesting(false);
 852           ASSERT_TRUE(pending_root);
 853           EXPECT_EQ(impl->pending_tree()->source_frame_number(), 1);
 854
 855           scroll_layer->ScrollBy(impl_thread_scroll2_);
 856           EXPECT_VECTOR_EQ(scroll_layer->BaseScrollOffset(), initial_scroll_);
 857           EXPECT_VECTOR_EQ(scroll_layer->ScrollDelta(),
 858                            impl_thread_scroll1_ + impl_thread_scroll2_);
 859
 860           LayerImpl* pending_scroll_layer = pending_root->children()[0];
 861           EXPECT_VECTOR_EQ(
 862               pending_scroll_layer->BaseScrollOffset(),
 863               gfx::ScrollOffsetWithDelta(
 864                   initial_scroll_, main_thread_scroll_ + impl_thread_scroll1_));
 865           EXPECT_VECTOR_EQ(pending_scroll_layer->ScrollDelta(),
 866                            impl_thread_scroll2_);
 867         }
 868         break;
 869       case 1:
 870         EXPECT_FALSE(impl->pending_tree());
 871         EXPECT_VECTOR_EQ(
 872             scroll_layer->BaseScrollOffset(),
 873             gfx::ScrollOffsetWithDelta(
 874                 initial_scroll_, main_thread_scroll_ + impl_thread_scroll1_));
 875         EXPECT_VECTOR_EQ(scroll_layer->ScrollDelta(), impl_thread_scroll2_);
 876         EndTest();
 877         break;
 878     }
 879   }
 880
 881   void ApplyViewportDeltas(const gfx::Vector2dF& inner_delta,
 882                            const gfx::Vector2dF& outer_delta,
 883                            const gfx::Vector2dF& elastic_overscroll_delta,
 884                            float scale,
 885                            float top_controls_delta) override {
 886     num_scrolls_++;
 887   }
 888
 889   void AfterTest() override { EXPECT_EQ(1, num_scrolls_); }
 890
 891  private:
 892   gfx::ScrollOffset initial_scroll_;
 893   gfx::Vector2dF main_thread_scroll_;
 894   gfx::Vector2dF impl_thread_scroll1_;
 895   gfx::Vector2dF impl_thread_scroll2_;
 896   int num_scrolls_;
 897 };
 898
 899 MULTI_THREAD_TEST_F(ImplSidePaintingScrollTestSimple);
 900
 901 // This test makes sure that layers pick up scrolls that occur between
 902 // beginning a commit and finishing a commit (aka scroll deltas not
 903 // included in sent scroll delta) still apply to layers that don't
 904 // push properties.
 905 class ImplSidePaintingScrollTestImplOnlyScroll
 906     : public ImplSidePaintingScrollTest {
 907  public:
 908   ImplSidePaintingScrollTestImplOnlyScroll()
 909       : initial_scroll_(20, 10), impl_thread_scroll_(-2, 3), impl_scale_(2.f) {}
 910
 911   void SetupTree() override {
 912     LayerTreeHostScrollTest::SetupTree();
 913     Layer* root_layer = layer_tree_host()->root_layer();
 914     scoped_refptr<Layer> root_scroll_layer = Layer::Create(layer_settings());
 915     root_scroll_layer->SetScrollClipLayerId(root_layer->id());
 916     root_scroll_layer->SetScrollOffset(initial_scroll_);
 917     root_scroll_layer->SetBounds(
 918         gfx::Size(root_layer->bounds().width() + 100,
 919                   root_layer->bounds().height() + 100));
 920     root_scroll_layer->SetIsDrawable(true);
 921     root_scroll_layer->SetIsContainerForFixedPositionLayers(true);
 922     root_layer->AddChild(root_scroll_layer);
 923
 924     layer_tree_host()->RegisterViewportLayers(NULL, root_layer,
 925                                               root_scroll_layer, NULL);
 926     layer_tree_host()->SetPageScaleFactorAndLimits(1.f, 0.01f, 100.f);
 927   }
 928
 929   void BeginTest() override { PostSetNeedsCommitToMainThread(); }
 930
 931   void WillCommit() override {
 932     Layer* root = layer_tree_host()->root_layer();
 933     Layer* scroll_layer = root->children()[0].get();
 934     switch (layer_tree_host()->source_frame_number()) {
 935       case 0:
 936         EXPECT_TRUE(scroll_layer->needs_push_properties());
 937         break;
 938       case 1:
 939         // Even if this layer doesn't need push properties, it should
 940         // still pick up scrolls that happen on the active layer during
 941         // commit.
 942         EXPECT_FALSE(scroll_layer->needs_push_properties());
 943         break;
 944     }
 945   }
 946
 947   void BeginCommitOnThread(LayerTreeHostImpl* impl) override {
 948     // Scroll after the 2nd commit has started.
 949     if (impl->active_tree()->source_frame_number() == 0) {
 950       LayerImpl* active_root = impl->active_tree()->root_layer();
 951       LayerImpl* active_scroll_layer = active_root->children()[0];
 952       ASSERT_TRUE(active_root);
 953       ASSERT_TRUE(active_scroll_layer);
 954       active_scroll_layer->ScrollBy(impl_thread_scroll_);
 955       impl->SetPageScaleOnActiveTree(impl_scale_);
 956     }
 957   }
 958
 959   void CommitCompleteOnThread(LayerTreeHostImpl* impl) override {
 960     // We force a second draw here of the first commit before activating
 961     // the second commit.
 962     LayerImpl* active_root = impl->active_tree()->root_layer();
 963     LayerImpl* active_scroll_layer =
 964         active_root ? active_root->children()[0] : NULL;
 965     LayerImpl* pending_root = impl->pending_tree()->root_layer();
 966     LayerImpl* pending_scroll_layer = pending_root->children()[0];
 967
 968     ASSERT_TRUE(pending_root);
 969     ASSERT_TRUE(pending_scroll_layer);
 970     switch (impl->pending_tree()->source_frame_number()) {
 971       case 0:
 972         EXPECT_VECTOR_EQ(pending_scroll_layer->BaseScrollOffset(),
 973                          initial_scroll_);
 974         EXPECT_VECTOR_EQ(pending_scroll_layer->ScrollDelta(), gfx::Vector2d());
 975         EXPECT_FALSE(active_root);
 976         break;
 977       case 1:
 978         // Even though the scroll happened during the commit, both layers
 979         // should have the appropriate scroll delta.
 980         EXPECT_VECTOR_EQ(pending_scroll_layer->BaseScrollOffset(),
 981                          initial_scroll_);
 982         EXPECT_VECTOR_EQ(pending_scroll_layer->ScrollDelta(),
 983                          impl_thread_scroll_);
 984         ASSERT_TRUE(active_root);
 985         EXPECT_VECTOR_EQ(active_scroll_layer->BaseScrollOffset(),
 986                          initial_scroll_);
 987         EXPECT_VECTOR_EQ(active_scroll_layer->ScrollDelta(),
 988                          impl_thread_scroll_);
 989         break;
 990       case 2:
 991         // On the next commit, this delta should have been sent and applied.
 992         EXPECT_VECTOR_EQ(
 993             pending_scroll_layer->BaseScrollOffset(),
 994             gfx::ScrollOffsetWithDelta(initial_scroll_, impl_thread_scroll_));
 995         EXPECT_VECTOR_EQ(pending_scroll_layer->ScrollDelta(), gfx::Vector2d());
 996         break;
 997     }
 998   }
 999
1000   void DrawLayersOnThread(LayerTreeHostImpl* impl) override {
1001     ImplSidePaintingScrollTest::DrawLayersOnThread(impl);
1002
1003     LayerImpl* root = impl->active_tree()->root_layer();
1004     LayerImpl* scroll_layer = root->children()[0];
1005
1006     switch (impl->active_tree()->source_frame_number()) {
1007       case 0:
1008         EXPECT_VECTOR_EQ(scroll_layer->BaseScrollOffset(), initial_scroll_);
1009         EXPECT_VECTOR_EQ(scroll_layer->ScrollDelta(), gfx::Vector2d());
1010         EXPECT_EQ(1.f, impl->active_tree()->page_scale_delta());
1011         EXPECT_EQ(1.f, impl->active_tree()->current_page_scale_factor());
1012         PostSetNeedsCommitToMainThread();
1013         break;
1014       case 1:
1015         EXPECT_VECTOR_EQ(scroll_layer->BaseScrollOffset(), initial_scroll_);
1016         EXPECT_VECTOR_EQ(scroll_layer->ScrollDelta(), impl_thread_scroll_);
1017         EXPECT_EQ(impl_scale_, impl->active_tree()->page_scale_delta());
1018         EXPECT_EQ(impl_scale_,
1019                   impl->active_tree()->current_page_scale_factor());
1020         PostSetNeedsCommitToMainThread();
1021         break;
1022       case 2:
1023         EXPECT_EQ(1.f, impl->active_tree()->page_scale_delta());
1024         EXPECT_EQ(impl_scale_,
1025                   impl->active_tree()->current_page_scale_factor());
1026         EndTest();
1027         break;
1028     }
1029   }
1030
1031   void AfterTest() override {}
1032
1033  private:
1034   gfx::ScrollOffset initial_scroll_;
1035   gfx::Vector2dF impl_thread_scroll_;
1036   float impl_scale_;
1037 };
1038
1039 MULTI_THREAD_TEST_F(ImplSidePaintingScrollTestImplOnlyScroll);
1040
1041 class LayerTreeHostScrollTestScrollZeroMaxScrollOffset
1042     : public LayerTreeHostScrollTest {
1043  public:
1044   LayerTreeHostScrollTestScrollZeroMaxScrollOffset() {}
1045
1046   void SetupTree() override {
1047     LayerTreeTest::SetupTree();
1048     scoped_refptr<Layer> scroll_layer = Layer::Create(layer_settings());
1049     layer_tree_host()->root_layer()->AddChild(scroll_layer);
1050   }
1051
1052   void BeginTest() override { PostSetNeedsCommitToMainThread(); }
1053
1054   void DrawLayersOnThread(LayerTreeHostImpl* impl) override {
1055     LayerImpl* root = impl->active_tree()->root_layer();
1056     LayerImpl* scroll_layer = root->children()[0];
1057     scroll_layer->SetScrollClipLayer(root->id());
1058
1059     // Set max_scroll_offset = (100, 100).
1060     scroll_layer->SetBounds(
1061         gfx::Size(root->bounds().width() + 100, root->bounds().height() + 100));
1062     EXPECT_EQ(
1063         InputHandler::SCROLL_STARTED,
1064         scroll_layer->TryScroll(gfx::PointF(0.0f, 1.0f), InputHandler::GESTURE,
1065                                 SCROLL_BLOCKS_ON_NONE));
1066
1067     // Set max_scroll_offset = (0, 0).
1068     scroll_layer->SetBounds(root->bounds());
1069     EXPECT_EQ(
1070         InputHandler::SCROLL_IGNORED,
1071         scroll_layer->TryScroll(gfx::PointF(0.0f, 1.0f), InputHandler::GESTURE,
1072                                 SCROLL_BLOCKS_ON_NONE));
1073
1074     // Set max_scroll_offset = (-100, -100).
1075     scroll_layer->SetBounds(gfx::Size());
1076     EXPECT_EQ(
1077         InputHandler::SCROLL_IGNORED,
1078         scroll_layer->TryScroll(gfx::PointF(0.0f, 1.0f), InputHandler::GESTURE,
1079                                 SCROLL_BLOCKS_ON_NONE));
1080
1081     EndTest();
1082   }
1083
1084   void AfterTest() override {}
1085 };
1086
1087 SINGLE_AND_MULTI_THREAD_TEST_F(
1088     LayerTreeHostScrollTestScrollZeroMaxScrollOffset);
1089
1090 class ThreadCheckingInputHandlerClient : public InputHandlerClient {
1091  public:
1092   ThreadCheckingInputHandlerClient(base::SingleThreadTaskRunner* runner,
1093                                    bool* received_stop_flinging)
1094       : task_runner_(runner), received_stop_flinging_(received_stop_flinging) {}
1095
1096   void WillShutdown() override {
1097     if (!received_stop_flinging_)
1098       ADD_FAILURE() << "WillShutdown() called before fling stopped";
1099   }
1100
1101   void Animate(base::TimeTicks time) override {
1102     if (!task_runner_->BelongsToCurrentThread())
1103       ADD_FAILURE() << "Animate called on wrong thread";
1104   }
1105
1106   void MainThreadHasStoppedFlinging() override {
1107     if (!task_runner_->BelongsToCurrentThread())
1108       ADD_FAILURE() << "MainThreadHasStoppedFlinging called on wrong thread";
1109     *received_stop_flinging_ = true;
1110   }
1111
1112   void ReconcileElasticOverscrollAndRootScroll() override {
1113     if (!task_runner_->BelongsToCurrentThread()) {
1114       ADD_FAILURE() << "ReconcileElasticOverscrollAndRootScroll called on "
1115                     << "wrong thread";
1116     }
1117   }
1118
1119  private:
1120   base::SingleThreadTaskRunner* task_runner_;
1121   bool* received_stop_flinging_;
1122 };
1123
1124 void BindInputHandlerOnCompositorThread(
1125     const base::WeakPtr<InputHandler>& input_handler,
1126     ThreadCheckingInputHandlerClient* client) {
1127   input_handler->BindToClient(client);
1128 }
1129
1130 TEST(LayerTreeHostFlingTest, DidStopFlingingThread) {
1131   base::Thread impl_thread("cc");
1132   ASSERT_TRUE(impl_thread.Start());
1133
1134   bool received_stop_flinging = false;
1135   LayerTreeSettings settings;
1136
1137   ThreadCheckingInputHandlerClient input_handler_client(
1138       impl_thread.task_runner().get(), &received_stop_flinging);
1139   FakeLayerTreeHostClient client(FakeLayerTreeHostClient::DIRECT_3D);
1140
1141   ASSERT_TRUE(impl_thread.task_runner().get());
1142   scoped_ptr<SharedBitmapManager> shared_bitmap_manager(
1143       new TestSharedBitmapManager());
1144
1145   LayerTreeHost::InitParams params;
1146   params.client = &client;
1147   params.shared_bitmap_manager = shared_bitmap_manager.get();
1148   params.settings = &settings;
1149   params.main_task_runner = base::ThreadTaskRunnerHandle::Get();
1150   scoped_ptr<LayerTreeHost> layer_tree_host =
1151       LayerTreeHost::CreateThreaded(impl_thread.task_runner(), &params);
1152
1153   impl_thread.task_runner()->PostTask(
1154       FROM_HERE, base::Bind(&BindInputHandlerOnCompositorThread,
1155                             layer_tree_host->GetInputHandler(),
1156                             base::Unretained(&input_handler_client)));
1157
1158   layer_tree_host->DidStopFlinging();
1159   layer_tree_host = nullptr;
1160   impl_thread.Stop();
1161   EXPECT_TRUE(received_stop_flinging);
1162 }
1163
1164 class LayerTreeHostScrollTestLayerStructureChange
1165     : public LayerTreeHostScrollTest {
1166  public:
1167   LayerTreeHostScrollTestLayerStructureChange()
1168       : scroll_destroy_whole_tree_(false) {}
1169
1170   void SetupTree() override {
1171     scoped_refptr<Layer> root_layer = Layer::Create(layer_settings());
1172     root_layer->SetBounds(gfx::Size(10, 10));
1173
1174     Layer* root_scroll_layer =
1175         CreateScrollLayer(root_layer.get(), &root_scroll_layer_client_);
1176     CreateScrollLayer(root_layer.get(), &sibling_scroll_layer_client_);
1177     CreateScrollLayer(root_scroll_layer, &child_scroll_layer_client_);
1178
1179     layer_tree_host()->SetRootLayer(root_layer);
1180     LayerTreeHostScrollTest::SetupTree();
1181   }
1182
1183   void BeginTest() override { PostSetNeedsCommitToMainThread(); }
1184
1185   void DrawLayersOnThread(LayerTreeHostImpl* impl) override {
1186     LayerImpl* root = impl->active_tree()->root_layer();
1187     switch (impl->active_tree()->source_frame_number()) {
1188       case 0:
1189         root->child_at(0)->SetScrollDelta(gfx::Vector2dF(5, 5));
1190         root->child_at(0)->child_at(0)->SetScrollDelta(gfx::Vector2dF(5, 5));
1191         root->child_at(1)->SetScrollDelta(gfx::Vector2dF(5, 5));
1192         PostSetNeedsCommitToMainThread();
1193         break;
1194       case 1:
1195         EndTest();
1196         break;
1197     }
1198   }
1199
1200   void AfterTest() override {}
1201
1202   virtual void DidScroll(Layer* layer) {
1203     if (scroll_destroy_whole_tree_) {
1204       layer_tree_host()->SetRootLayer(NULL);
1205       EndTest();
1206       return;
1207     }
1208     layer->RemoveFromParent();
1209   }
1210
1211  protected:
1212   class FakeLayerScrollClient {
1213    public:
1214     void DidScroll() {
1215       owner_->DidScroll(layer_);
1216     }
1217     LayerTreeHostScrollTestLayerStructureChange* owner_;
1218     Layer* layer_;
1219   };
1220
1221   Layer* CreateScrollLayer(Layer* parent, FakeLayerScrollClient* client) {
1222     scoped_refptr<PictureLayer> scroll_layer =
1223         PictureLayer::Create(layer_settings(), &fake_content_layer_client_);
1224     scroll_layer->SetBounds(gfx::Size(110, 110));
1225     scroll_layer->SetPosition(gfx::Point(0, 0));
1226     scroll_layer->SetIsDrawable(true);
1227     scroll_layer->SetScrollClipLayerId(parent->id());
1228     scroll_layer->SetBounds(gfx::Size(parent->bounds().width() + 100,
1229                                       parent->bounds().height() + 100));
1230     scroll_layer->set_did_scroll_callback(base::Bind(
1231         &FakeLayerScrollClient::DidScroll, base::Unretained(client)));
1232     client->owner_ = this;
1233     client->layer_ = scroll_layer.get();
1234     parent->AddChild(scroll_layer);
1235     return scroll_layer.get();
1236   }
1237
1238   FakeLayerScrollClient root_scroll_layer_client_;
1239   FakeLayerScrollClient sibling_scroll_layer_client_;
1240   FakeLayerScrollClient child_scroll_layer_client_;
1241
1242   FakeContentLayerClient fake_content_layer_client_;
1243
1244   bool scroll_destroy_whole_tree_;
1245 };
1246
1247 TEST_F(LayerTreeHostScrollTestLayerStructureChange, ScrollDestroyLayer) {
1248   RunTest(true, false, true);
1249 }
1250
1251 TEST_F(LayerTreeHostScrollTestLayerStructureChange, ScrollDestroyWholeTree) {
1252   scroll_destroy_whole_tree_ = true;
1253   RunTest(true, false, true);
1254 }
1255
1256 }  // namespace
1257 }  // namespace cc