chrome/browser/prerender/prerender_contents.cc

   1 // Copyright (c) 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 "chrome/browser/prerender/prerender_contents.h"
   6
   7 #include <algorithm>
   8 #include <functional>
   9 #include <utility>
  10
  11 #include "base/bind.h"
  12 #include "base/strings/utf_string_conversions.h"
  13 #include "chrome/browser/chrome_notification_types.h"
  14 #include "chrome/browser/history/history_tab_helper.h"
  15 #include "chrome/browser/prerender/prerender_field_trial.h"
  16 #include "chrome/browser/prerender/prerender_final_status.h"
  17 #include "chrome/browser/prerender/prerender_handle.h"
  18 #include "chrome/browser/prerender/prerender_manager.h"
  19 #include "chrome/browser/prerender/prerender_manager_factory.h"
  20 #include "chrome/browser/prerender/prerender_resource_throttle.h"
  21 #include "chrome/browser/profiles/profile.h"
  22 #include "chrome/browser/ui/browser.h"
  23 #include "chrome/browser/ui/tab_helpers.h"
  24 #include "chrome/browser/ui/web_contents_sizer.h"
  25 #include "chrome/common/prerender_messages.h"
  26 #include "chrome/common/render_messages.h"
  27 #include "chrome/common/url_constants.h"
  28 #include "components/history/core/browser/history_types.h"
  29 #include "content/public/browser/browser_child_process_host.h"
  30 #include "content/public/browser/browser_thread.h"
  31 #include "content/public/browser/notification_service.h"
  32 #include "content/public/browser/render_frame_host.h"
  33 #include "content/public/browser/render_process_host.h"
  34 #include "content/public/browser/render_view_host.h"
  35 #include "content/public/browser/resource_request_details.h"
  36 #include "content/public/browser/session_storage_namespace.h"
  37 #include "content/public/browser/web_contents.h"
  38 #include "content/public/browser/web_contents_delegate.h"
  39 #include "content/public/common/frame_navigate_params.h"
  40 #include "ui/base/page_transition_types.h"
  41 #include "ui/gfx/geometry/rect.h"
  42
  43 using content::BrowserThread;
  44 using content::DownloadItem;
  45 using content::OpenURLParams;
  46 using content::RenderViewHost;
  47 using content::ResourceRedirectDetails;
  48 using content::ResourceType;
  49 using content::SessionStorageNamespace;
  50 using content::WebContents;
  51
  52 namespace prerender {
  53
  54 namespace {
  55
  56 void ResumeThrottles(
  57     std::vector<base::WeakPtr<PrerenderResourceThrottle> > throttles) {
  58   for (size_t i = 0; i < throttles.size(); i++) {
  59     if (throttles[i])
  60       throttles[i]->Resume();
  61   }
  62 }
  63
  64 }  // namespace
  65
  66 class PrerenderContentsFactoryImpl : public PrerenderContents::Factory {
  67  public:
  68   PrerenderContents* CreatePrerenderContents(
  69       PrerenderManager* prerender_manager,
  70       Profile* profile,
  71       const GURL& url,
  72       const content::Referrer& referrer,
  73       Origin origin,
  74       uint8 experiment_id) override {
  75     return new PrerenderContents(prerender_manager, profile,
  76                                  url, referrer, origin, experiment_id);
  77   }
  78 };
  79
  80 // WebContentsDelegateImpl -----------------------------------------------------
  81
  82 class PrerenderContents::WebContentsDelegateImpl
  83     : public content::WebContentsDelegate {
  84  public:
  85   explicit WebContentsDelegateImpl(PrerenderContents* prerender_contents)
  86       : prerender_contents_(prerender_contents) {
  87   }
  88
  89   // content::WebContentsDelegate implementation:
  90   WebContents* OpenURLFromTab(WebContents* source,
  91                               const OpenURLParams& params) override {
  92     // |OpenURLFromTab| is typically called when a frame performs a navigation
  93     // that requires the browser to perform the transition instead of WebKit.
  94     // Examples include prerendering a site that redirects to an app URL,
  95     // or if --enable-strict-site-isolation is specified and the prerendered
  96     // frame redirects to a different origin.
  97     // TODO(cbentzel): Consider supporting this if it is a common case during
  98     // prerenders.
  99     prerender_contents_->Destroy(FINAL_STATUS_OPEN_URL);
 100     return NULL;
 101   }
 102
 103   void CloseContents(content::WebContents* contents) override {
 104     prerender_contents_->Destroy(FINAL_STATUS_CLOSED);
 105   }
 106
 107   void CanDownload(RenderViewHost* render_view_host,
 108                    const GURL& url,
 109                    const std::string& request_method,
 110                    const base::Callback<void(bool)>& callback) override {
 111     prerender_contents_->Destroy(FINAL_STATUS_DOWNLOAD);
 112     // Cancel the download.
 113     callback.Run(false);
 114   }
 115
 116   bool ShouldCreateWebContents(
 117       WebContents* web_contents,
 118       int route_id,
 119       int main_frame_route_id,
 120       WindowContainerType window_container_type,
 121       const base::string16& frame_name,
 122       const GURL& target_url,
 123       const std::string& partition_id,
 124       SessionStorageNamespace* session_storage_namespace) override {
 125     // Since we don't want to permit child windows that would have a
 126     // window.opener property, terminate prerendering.
 127     prerender_contents_->Destroy(FINAL_STATUS_CREATE_NEW_WINDOW);
 128     // Cancel the popup.
 129     return false;
 130   }
 131
 132   bool OnGoToEntryOffset(int offset) override {
 133     // This isn't allowed because the history merge operation
 134     // does not work if there are renderer issued challenges.
 135     // TODO(cbentzel): Cancel in this case? May not need to do
 136     // since render-issued offset navigations are not guaranteed,
 137     // but indicates that the page cares about the history.
 138     return false;
 139   }
 140
 141   bool ShouldSuppressDialogs(WebContents* source) override {
 142     // We still want to show the user the message when they navigate to this
 143     // page, so cancel this prerender.
 144     prerender_contents_->Destroy(FINAL_STATUS_JAVASCRIPT_ALERT);
 145     // Always suppress JavaScript messages if they're triggered by a page being
 146     // prerendered.
 147     return true;
 148   }
 149
 150   void RegisterProtocolHandler(WebContents* web_contents,
 151                                const std::string& protocol,
 152                                const GURL& url,
 153                                bool user_gesture) override {
 154     // TODO(mmenke): Consider supporting this if it is a common case during
 155     // prerenders.
 156     prerender_contents_->Destroy(FINAL_STATUS_REGISTER_PROTOCOL_HANDLER);
 157   }
 158
 159   gfx::Size GetSizeForNewRenderView(WebContents* web_contents) const override {
 160     // Have to set the size of the RenderView on initialization to be sure it is
 161     // set before the RenderView is hidden on all platforms (esp. Android).
 162     return prerender_contents_->size_;
 163   }
 164
 165  private:
 166   PrerenderContents* prerender_contents_;
 167 };
 168
 169 void PrerenderContents::Observer::OnPrerenderStopLoading(
 170     PrerenderContents* contents) {
 171 }
 172
 173 void PrerenderContents::Observer::OnPrerenderDomContentLoaded(
 174     PrerenderContents* contents) {
 175 }
 176
 177 void PrerenderContents::Observer::OnPrerenderCreatedMatchCompleteReplacement(
 178     PrerenderContents* contents, PrerenderContents* replacement) {
 179 }
 180
 181 PrerenderContents::Observer::Observer() {
 182 }
 183
 184 PrerenderContents::Observer::~Observer() {
 185 }
 186
 187 PrerenderContents::PrerenderContents(
 188     PrerenderManager* prerender_manager,
 189     Profile* profile,
 190     const GURL& url,
 191     const content::Referrer& referrer,
 192     Origin origin,
 193     uint8 experiment_id)
 194     : prerendering_has_started_(false),
 195       session_storage_namespace_id_(-1),
 196       prerender_manager_(prerender_manager),
 197       prerender_url_(url),
 198       referrer_(referrer),
 199       profile_(profile),
 200       page_id_(0),
 201       has_stopped_loading_(false),
 202       has_finished_loading_(false),
 203       final_status_(FINAL_STATUS_MAX),
 204       match_complete_status_(MATCH_COMPLETE_DEFAULT),
 205       prerendering_has_been_cancelled_(false),
 206       child_id_(-1),
 207       route_id_(-1),
 208       origin_(origin),
 209       experiment_id_(experiment_id),
 210       network_bytes_(0) {
 211   DCHECK(prerender_manager != NULL);
 212 }
 213
 214 PrerenderContents* PrerenderContents::CreateMatchCompleteReplacement() {
 215   PrerenderContents* new_contents = prerender_manager_->CreatePrerenderContents(
 216       prerender_url(), referrer(), origin(), experiment_id());
 217
 218   new_contents->load_start_time_ = load_start_time_;
 219   new_contents->session_storage_namespace_id_ = session_storage_namespace_id_;
 220   new_contents->set_match_complete_status(
 221       PrerenderContents::MATCH_COMPLETE_REPLACEMENT_PENDING);
 222
 223   const bool did_init = new_contents->Init();
 224   DCHECK(did_init);
 225   DCHECK_EQ(alias_urls_.front(), new_contents->alias_urls_.front());
 226   DCHECK_EQ(1u, new_contents->alias_urls_.size());
 227   new_contents->alias_urls_ = alias_urls_;
 228   // Erase all but the first alias URL; the replacement has adopted the
 229   // remainder without increasing the renderer-side reference count.
 230   alias_urls_.resize(1);
 231   new_contents->set_match_complete_status(
 232       PrerenderContents::MATCH_COMPLETE_REPLACEMENT);
 233   NotifyPrerenderCreatedMatchCompleteReplacement(new_contents);
 234   return new_contents;
 235 }
 236
 237 bool PrerenderContents::Init() {
 238   return AddAliasURL(prerender_url_);
 239 }
 240
 241 // static
 242 PrerenderContents::Factory* PrerenderContents::CreateFactory() {
 243   return new PrerenderContentsFactoryImpl();
 244 }
 245
 246 // static
 247 PrerenderContents* PrerenderContents::FromWebContents(
 248     content::WebContents* web_contents) {
 249   if (!web_contents)
 250     return NULL;
 251   PrerenderManager* prerender_manager = PrerenderManagerFactory::GetForProfile(
 252       Profile::FromBrowserContext(web_contents->GetBrowserContext()));
 253   if (!prerender_manager)
 254     return NULL;
 255   return prerender_manager->GetPrerenderContents(web_contents);
 256 }
 257
 258 void PrerenderContents::StartPrerendering(
 259     const gfx::Size& size,
 260     SessionStorageNamespace* session_storage_namespace) {
 261   DCHECK(profile_ != NULL);
 262   DCHECK(!size.IsEmpty());
 263   DCHECK(!prerendering_has_started_);
 264   DCHECK(prerender_contents_.get() == NULL);
 265   DCHECK(size_.IsEmpty());
 266   DCHECK_EQ(1U, alias_urls_.size());
 267
 268   session_storage_namespace_id_ = session_storage_namespace->id();
 269   size_ = size;
 270
 271   DCHECK(load_start_time_.is_null());
 272   load_start_time_ = base::TimeTicks::Now();
 273
 274   // Everything after this point sets up the WebContents object and associated
 275   // RenderView for the prerender page. Don't do this for members of the
 276   // control group.
 277   if (prerender_manager_->IsControlGroup(experiment_id()))
 278     return;
 279
 280   if (origin_ == ORIGIN_LOCAL_PREDICTOR &&
 281       IsLocalPredictorPrerenderAlwaysControlEnabled()) {
 282     return;
 283   }
 284
 285   prerendering_has_started_ = true;
 286
 287   prerender_contents_.reset(CreateWebContents(session_storage_namespace));
 288   TabHelpers::AttachTabHelpers(prerender_contents_.get());
 289   content::WebContentsObserver::Observe(prerender_contents_.get());
 290
 291   web_contents_delegate_.reset(new WebContentsDelegateImpl(this));
 292   prerender_contents_.get()->SetDelegate(web_contents_delegate_.get());
 293   // Set the size of the prerender WebContents.
 294   ResizeWebContents(prerender_contents_.get(), size_);
 295
 296   // TODO(davidben): This logic assumes each prerender has at most one
 297   // route. https://crbug.com/440544
 298   child_id_ = GetRenderViewHost()->GetProcess()->GetID();
 299   route_id_ = GetRenderViewHost()->GetRoutingID();
 300
 301   // TODO(davidben): This logic assumes each prerender has at most one
 302   // process. https://crbug.com/440544
 303   prerender_manager()->AddPrerenderProcessHost(
 304       GetRenderViewHost()->GetProcess());
 305
 306   NotifyPrerenderStart();
 307
 308   // Close ourselves when the application is shutting down.
 309   notification_registrar_.Add(this, chrome::NOTIFICATION_APP_TERMINATING,
 310                               content::NotificationService::AllSources());
 311
 312   // Register to inform new RenderViews that we're prerendering.
 313   notification_registrar_.Add(
 314       this, content::NOTIFICATION_WEB_CONTENTS_RENDER_VIEW_HOST_CREATED,
 315       content::Source<WebContents>(prerender_contents_.get()));
 316
 317   // Transfer over the user agent override.
 318   prerender_contents_.get()->SetUserAgentOverride(
 319       prerender_manager_->config().user_agent_override);
 320
 321   content::NavigationController::LoadURLParams load_url_params(
 322       prerender_url_);
 323   load_url_params.referrer = referrer_;
 324   load_url_params.transition_type = ui::PAGE_TRANSITION_LINK;
 325   if (origin_ == ORIGIN_OMNIBOX) {
 326     load_url_params.transition_type = ui::PageTransitionFromInt(
 327         ui::PAGE_TRANSITION_TYPED |
 328         ui::PAGE_TRANSITION_FROM_ADDRESS_BAR);
 329   } else if (origin_ == ORIGIN_INSTANT) {
 330     load_url_params.transition_type = ui::PageTransitionFromInt(
 331         ui::PAGE_TRANSITION_GENERATED |
 332         ui::PAGE_TRANSITION_FROM_ADDRESS_BAR);
 333   }
 334   load_url_params.override_user_agent =
 335       prerender_manager_->config().is_overriding_user_agent ?
 336       content::NavigationController::UA_OVERRIDE_TRUE :
 337       content::NavigationController::UA_OVERRIDE_FALSE;
 338   prerender_contents_.get()->GetController().LoadURLWithParams(load_url_params);
 339 }
 340
 341 bool PrerenderContents::GetChildId(int* child_id) const {
 342   CHECK(child_id);
 343   DCHECK_GE(child_id_, -1);
 344   *child_id = child_id_;
 345   return child_id_ != -1;
 346 }
 347
 348 bool PrerenderContents::GetRouteId(int* route_id) const {
 349   CHECK(route_id);
 350   DCHECK_GE(route_id_, -1);
 351   *route_id = route_id_;
 352   return route_id_ != -1;
 353 }
 354
 355 void PrerenderContents::SetFinalStatus(FinalStatus final_status) {
 356   DCHECK_GE(final_status, FINAL_STATUS_USED);
 357   DCHECK_LT(final_status, FINAL_STATUS_MAX);
 358
 359   DCHECK_EQ(FINAL_STATUS_MAX, final_status_);
 360
 361   final_status_ = final_status;
 362 }
 363
 364 PrerenderContents::~PrerenderContents() {
 365   DCHECK_NE(FINAL_STATUS_MAX, final_status());
 366   DCHECK(
 367       prerendering_has_been_cancelled() || final_status() == FINAL_STATUS_USED);
 368   DCHECK_NE(ORIGIN_MAX, origin());
 369
 370   prerender_manager_->RecordFinalStatusWithMatchCompleteStatus(
 371       origin(), experiment_id(), match_complete_status(), final_status());
 372
 373   bool used = final_status() == FINAL_STATUS_USED ||
 374               final_status() == FINAL_STATUS_WOULD_HAVE_BEEN_USED;
 375   prerender_manager_->RecordNetworkBytes(origin(), used, network_bytes_);
 376
 377   // Broadcast the removal of aliases.
 378   for (content::RenderProcessHost::iterator host_iterator =
 379            content::RenderProcessHost::AllHostsIterator();
 380        !host_iterator.IsAtEnd();
 381        host_iterator.Advance()) {
 382     content::RenderProcessHost* host = host_iterator.GetCurrentValue();
 383     host->Send(new PrerenderMsg_OnPrerenderRemoveAliases(alias_urls_));
 384   }
 385
 386   // If we still have a WebContents, clean up anything we need to and then
 387   // destroy it.
 388   if (prerender_contents_.get())
 389     delete ReleasePrerenderContents();
 390 }
 391
 392 void PrerenderContents::AddObserver(Observer* observer) {
 393   DCHECK_EQ(FINAL_STATUS_MAX, final_status_);
 394   observer_list_.AddObserver(observer);
 395 }
 396
 397 void PrerenderContents::RemoveObserver(Observer* observer) {
 398   observer_list_.RemoveObserver(observer);
 399 }
 400
 401 void PrerenderContents::Observe(int type,
 402                                 const content::NotificationSource& source,
 403                                 const content::NotificationDetails& details) {
 404   switch (type) {
 405     // TODO(davidben): Try to remove this in favor of relying on
 406     // FINAL_STATUS_PROFILE_DESTROYED.
 407     case chrome::NOTIFICATION_APP_TERMINATING:
 408       Destroy(FINAL_STATUS_APP_TERMINATING);
 409       return;
 410
 411     case content::NOTIFICATION_WEB_CONTENTS_RENDER_VIEW_HOST_CREATED: {
 412       if (prerender_contents_.get()) {
 413         DCHECK_EQ(content::Source<WebContents>(source).ptr(),
 414                   prerender_contents_.get());
 415
 416         content::Details<RenderViewHost> new_render_view_host(details);
 417         OnRenderViewHostCreated(new_render_view_host.ptr());
 418
 419         // Make sure the size of the RenderViewHost has been passed to the new
 420         // RenderView.  Otherwise, the size may not be sent until the
 421         // RenderViewReady event makes it from the render process to the UI
 422         // thread of the browser process.  When the RenderView receives its
 423         // size, is also sets itself to be visible, which would then break the
 424         // visibility API.
 425         new_render_view_host->WasResized();
 426         prerender_contents_->WasHidden();
 427       }
 428       break;
 429     }
 430
 431     default:
 432       NOTREACHED() << "Unexpected notification sent.";
 433       break;
 434   }
 435 }
 436
 437 void PrerenderContents::OnRenderViewHostCreated(
 438     RenderViewHost* new_render_view_host) {
 439 }
 440
 441 WebContents* PrerenderContents::CreateWebContents(
 442     SessionStorageNamespace* session_storage_namespace) {
 443   // TODO(ajwong): Remove the temporary map once prerendering is aware of
 444   // multiple session storage namespaces per tab.
 445   content::SessionStorageNamespaceMap session_storage_namespace_map;
 446   session_storage_namespace_map[std::string()] = session_storage_namespace;
 447   return WebContents::CreateWithSessionStorage(
 448       WebContents::CreateParams(profile_), session_storage_namespace_map);
 449 }
 450
 451 void PrerenderContents::NotifyPrerenderStart() {
 452   DCHECK_EQ(FINAL_STATUS_MAX, final_status_);
 453   FOR_EACH_OBSERVER(Observer, observer_list_, OnPrerenderStart(this));
 454 }
 455
 456 void PrerenderContents::NotifyPrerenderStopLoading() {
 457   FOR_EACH_OBSERVER(Observer, observer_list_, OnPrerenderStopLoading(this));
 458 }
 459
 460 void PrerenderContents::NotifyPrerenderDomContentLoaded() {
 461   FOR_EACH_OBSERVER(Observer, observer_list_,
 462                     OnPrerenderDomContentLoaded(this));
 463 }
 464
 465 void PrerenderContents::NotifyPrerenderStop() {
 466   DCHECK_NE(FINAL_STATUS_MAX, final_status_);
 467   FOR_EACH_OBSERVER(Observer, observer_list_, OnPrerenderStop(this));
 468   observer_list_.Clear();
 469 }
 470
 471 void PrerenderContents::NotifyPrerenderCreatedMatchCompleteReplacement(
 472     PrerenderContents* replacement) {
 473   FOR_EACH_OBSERVER(Observer, observer_list_,
 474                     OnPrerenderCreatedMatchCompleteReplacement(this,
 475                                                                replacement));
 476 }
 477
 478 bool PrerenderContents::OnMessageReceived(const IPC::Message& message) {
 479   bool handled = true;
 480   // The following messages we do want to consume.
 481   IPC_BEGIN_MESSAGE_MAP(PrerenderContents, message)
 482     IPC_MESSAGE_HANDLER(ChromeViewHostMsg_CancelPrerenderForPrinting,
 483                         OnCancelPrerenderForPrinting)
 484     IPC_MESSAGE_UNHANDLED(handled = false)
 485   IPC_END_MESSAGE_MAP()
 486
 487   return handled;
 488 }
 489
 490 bool PrerenderContents::CheckURL(const GURL& url) {
 491   if (!url.SchemeIsHTTPOrHTTPS()) {
 492     DCHECK_NE(MATCH_COMPLETE_REPLACEMENT_PENDING, match_complete_status_);
 493     Destroy(FINAL_STATUS_UNSUPPORTED_SCHEME);
 494     return false;
 495   }
 496   if (match_complete_status_ != MATCH_COMPLETE_REPLACEMENT_PENDING &&
 497       prerender_manager_->HasRecentlyBeenNavigatedTo(origin(), url)) {
 498     Destroy(FINAL_STATUS_RECENTLY_VISITED);
 499     return false;
 500   }
 501   return true;
 502 }
 503
 504 bool PrerenderContents::AddAliasURL(const GURL& url) {
 505   if (!CheckURL(url))
 506     return false;
 507
 508   alias_urls_.push_back(url);
 509
 510   for (content::RenderProcessHost::iterator host_iterator =
 511            content::RenderProcessHost::AllHostsIterator();
 512        !host_iterator.IsAtEnd();
 513        host_iterator.Advance()) {
 514     content::RenderProcessHost* host = host_iterator.GetCurrentValue();
 515     host->Send(new PrerenderMsg_OnPrerenderAddAlias(url));
 516   }
 517
 518   return true;
 519 }
 520
 521 bool PrerenderContents::Matches(
 522     const GURL& url,
 523     const SessionStorageNamespace* session_storage_namespace) const {
 524   // TODO(davidben): Remove any consumers that pass in a NULL
 525   // session_storage_namespace and only test with matches.
 526   if (session_storage_namespace &&
 527       session_storage_namespace_id_ != session_storage_namespace->id()) {
 528     return false;
 529   }
 530   return std::count_if(alias_urls_.begin(), alias_urls_.end(),
 531                        std::bind2nd(std::equal_to<GURL>(), url)) != 0;
 532 }
 533
 534 void PrerenderContents::RenderProcessGone(base::TerminationStatus status) {
 535   Destroy(FINAL_STATUS_RENDERER_CRASHED);
 536 }
 537
 538 void PrerenderContents::RenderFrameCreated(
 539     content::RenderFrameHost* render_frame_host) {
 540   // When a new RenderFrame is created for a prerendering WebContents, tell the
 541   // new RenderFrame it's being used for prerendering before any navigations
 542   // occur.  Note that this is always triggered before the first navigation, so
 543   // there's no need to send the message just after the WebContents is created.
 544   render_frame_host->Send(new PrerenderMsg_SetIsPrerendering(
 545       render_frame_host->GetRoutingID(), true));
 546 }
 547
 548 void PrerenderContents::DidStopLoading() {
 549   has_stopped_loading_ = true;
 550   NotifyPrerenderStopLoading();
 551 }
 552
 553 void PrerenderContents::DocumentLoadedInFrame(
 554     content::RenderFrameHost* render_frame_host) {
 555   if (!render_frame_host->GetParent())
 556     NotifyPrerenderDomContentLoaded();
 557 }
 558
 559 void PrerenderContents::DidStartProvisionalLoadForFrame(
 560     content::RenderFrameHost* render_frame_host,
 561     const GURL& validated_url,
 562     bool is_error_page,
 563     bool is_iframe_srcdoc) {
 564   if (!render_frame_host->GetParent()) {
 565     if (!CheckURL(validated_url))
 566       return;
 567
 568     // Usually, this event fires if the user clicks or enters a new URL.
 569     // Neither of these can happen in the case of an invisible prerender.
 570     // So the cause is: Some JavaScript caused a new URL to be loaded.  In that
 571     // case, the spinner would start again in the browser, so we must reset
 572     // has_stopped_loading_ so that the spinner won't be stopped.
 573     has_stopped_loading_ = false;
 574     has_finished_loading_ = false;
 575   }
 576 }
 577
 578 void PrerenderContents::DidFinishLoad(
 579     content::RenderFrameHost* render_frame_host,
 580     const GURL& validated_url) {
 581   if (!render_frame_host->GetParent())
 582     has_finished_loading_ = true;
 583 }
 584
 585 void PrerenderContents::DidNavigateMainFrame(
 586     const content::LoadCommittedDetails& details,
 587     const content::FrameNavigateParams& params) {
 588   // If the prerender made a second navigation entry, abort the prerender. This
 589   // avoids having to correctly implement a complex history merging case (this
 590   // interacts with location.replace) and correctly synchronize with the
 591   // renderer. The final status may be monitored to see we need to revisit this
 592   // decision. This does not affect client redirects as those do not push new
 593   // history entries. (Calls to location.replace, navigations before onload, and
 594   // <meta http-equiv=refresh> with timeouts under 1 second do not create
 595   // entries in Blink.)
 596   if (prerender_contents_->GetController().GetEntryCount() > 1) {
 597     Destroy(FINAL_STATUS_NEW_NAVIGATION_ENTRY);
 598     return;
 599   }
 600
 601   // Add each redirect as an alias. |params.url| is included in
 602   // |params.redirects|.
 603   //
 604   // TODO(davidben): We do not correctly patch up history for renderer-initated
 605   // navigations which add history entries. http://crbug.com/305660.
 606   for (size_t i = 0; i < params.redirects.size(); i++) {
 607     if (!AddAliasURL(params.redirects[i]))
 608       return;
 609   }
 610 }
 611
 612 void PrerenderContents::DidGetRedirectForResourceRequest(
 613     content::RenderFrameHost* render_frame_host,
 614     const content::ResourceRedirectDetails& details) {
 615   // DidGetRedirectForResourceRequest can come for any resource on a page.  If
 616   // it's a redirect on the top-level resource, the name needs to be remembered
 617   // for future matching, and if it redirects to an https resource, it needs to
 618   // be canceled. If a subresource is redirected, nothing changes.
 619   if (details.resource_type != content::RESOURCE_TYPE_MAIN_FRAME)
 620     return;
 621   CheckURL(details.new_url);
 622 }
 623
 624 void PrerenderContents::Destroy(FinalStatus final_status) {
 625   DCHECK_NE(final_status, FINAL_STATUS_USED);
 626
 627   if (prerendering_has_been_cancelled_)
 628     return;
 629
 630   SetFinalStatus(final_status);
 631
 632   prerendering_has_been_cancelled_ = true;
 633   prerender_manager_->AddToHistory(this);
 634   prerender_manager_->MoveEntryToPendingDelete(this, final_status);
 635
 636   // Note that if this PrerenderContents was made into a MatchComplete
 637   // replacement by MoveEntryToPendingDelete, NotifyPrerenderStop will
 638   // not reach the PrerenderHandle. Rather
 639   // OnPrerenderCreatedMatchCompleteReplacement will propogate that
 640   // information to the referer.
 641   if (!prerender_manager_->IsControlGroup(experiment_id()) &&
 642       (prerendering_has_started() ||
 643        match_complete_status() == MATCH_COMPLETE_REPLACEMENT)) {
 644     NotifyPrerenderStop();
 645   }
 646 }
 647
 648 base::ProcessMetrics* PrerenderContents::MaybeGetProcessMetrics() {
 649   if (process_metrics_.get() == NULL) {
 650     // If a PrenderContents hasn't started prerending, don't be fully formed.
 651     if (!GetRenderViewHost() || !GetRenderViewHost()->GetProcess())
 652       return NULL;
 653     base::ProcessHandle handle = GetRenderViewHost()->GetProcess()->GetHandle();
 654     if (handle == base::kNullProcessHandle)
 655       return NULL;
 656 #if !defined(OS_MACOSX)
 657     process_metrics_.reset(base::ProcessMetrics::CreateProcessMetrics(handle));
 658 #else
 659     process_metrics_.reset(base::ProcessMetrics::CreateProcessMetrics(
 660         handle,
 661         content::BrowserChildProcessHost::GetPortProvider()));
 662 #endif
 663   }
 664
 665   return process_metrics_.get();
 666 }
 667
 668 void PrerenderContents::DestroyWhenUsingTooManyResources() {
 669   base::ProcessMetrics* metrics = MaybeGetProcessMetrics();
 670   if (metrics == NULL)
 671     return;
 672
 673   size_t private_bytes, shared_bytes;
 674   if (metrics->GetMemoryBytes(&private_bytes, &shared_bytes) &&
 675       private_bytes > prerender_manager_->config().max_bytes) {
 676     Destroy(FINAL_STATUS_MEMORY_LIMIT_EXCEEDED);
 677   }
 678 }
 679
 680 WebContents* PrerenderContents::ReleasePrerenderContents() {
 681   prerender_contents_->SetDelegate(NULL);
 682   content::WebContentsObserver::Observe(NULL);
 683   return prerender_contents_.release();
 684 }
 685
 686 RenderViewHost* PrerenderContents::GetRenderViewHostMutable() {
 687   return const_cast<RenderViewHost*>(GetRenderViewHost());
 688 }
 689
 690 const RenderViewHost* PrerenderContents::GetRenderViewHost() const {
 691   if (!prerender_contents_.get())
 692     return NULL;
 693   return prerender_contents_->GetRenderViewHost();
 694 }
 695
 696 void PrerenderContents::DidNavigate(
 697     const history::HistoryAddPageArgs& add_page_args) {
 698   add_page_vector_.push_back(add_page_args);
 699 }
 700
 701 void PrerenderContents::CommitHistory(WebContents* tab) {
 702   HistoryTabHelper* history_tab_helper = HistoryTabHelper::FromWebContents(tab);
 703   for (size_t i = 0; i < add_page_vector_.size(); ++i)
 704     history_tab_helper->UpdateHistoryForNavigation(add_page_vector_[i]);
 705 }
 706
 707 base::Value* PrerenderContents::GetAsValue() const {
 708   if (!prerender_contents_.get())
 709     return NULL;
 710   base::DictionaryValue* dict_value = new base::DictionaryValue();
 711   dict_value->SetString("url", prerender_url_.spec());
 712   base::TimeTicks current_time = base::TimeTicks::Now();
 713   base::TimeDelta duration = current_time - load_start_time_;
 714   dict_value->SetInteger("duration", duration.InSeconds());
 715   dict_value->SetBoolean("is_loaded", prerender_contents_ &&
 716                                       !prerender_contents_->IsLoading());
 717   return dict_value;
 718 }
 719
 720 bool PrerenderContents::IsCrossSiteNavigationPending() const {
 721   if (!prerender_contents_)
 722     return false;
 723   return (prerender_contents_->GetSiteInstance() !=
 724           prerender_contents_->GetPendingSiteInstance());
 725 }
 726
 727 void PrerenderContents::PrepareForUse() {
 728   SetFinalStatus(FINAL_STATUS_USED);
 729
 730   if (prerender_contents_.get()) {
 731     prerender_contents_->SendToAllFrames(
 732         new PrerenderMsg_SetIsPrerendering(MSG_ROUTING_NONE, false));
 733   }
 734
 735   NotifyPrerenderStop();
 736
 737   BrowserThread::PostTask(
 738       BrowserThread::IO,
 739       FROM_HERE,
 740       base::Bind(&ResumeThrottles, resource_throttles_));
 741   resource_throttles_.clear();
 742 }
 743
 744 void PrerenderContents::OnCancelPrerenderForPrinting() {
 745   Destroy(FINAL_STATUS_WINDOW_PRINT);
 746 }
 747
 748 void PrerenderContents::AddResourceThrottle(
 749     const base::WeakPtr<PrerenderResourceThrottle>& throttle) {
 750   resource_throttles_.push_back(throttle);
 751 }
 752
 753 void PrerenderContents::AddNetworkBytes(int64 bytes) {
 754   network_bytes_ += bytes;
 755 }
 756
 757 }  // namespace prerender