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 "apps/ui/web_contents_sizer.h"
  12 #include "base/bind.h"
  13 #include "base/strings/utf_string_conversions.h"
  14 #include "chrome/browser/chrome_notification_types.h"
  15 #include "chrome/browser/history/history_tab_helper.h"
  16 #include "chrome/browser/history/history_types.h"
  17 #include "chrome/browser/prerender/prerender_field_trial.h"
  18 #include "chrome/browser/prerender/prerender_final_status.h"
  19 #include "chrome/browser/prerender/prerender_handle.h"
  20 #include "chrome/browser/prerender/prerender_manager.h"
  21 #include "chrome/browser/prerender/prerender_manager_factory.h"
  22 #include "chrome/browser/prerender/prerender_resource_throttle.h"
  23 #include "chrome/browser/prerender/prerender_tracker.h"
  24 #include "chrome/browser/profiles/profile.h"
  25 #include "chrome/browser/ui/browser.h"
  26 #include "chrome/browser/ui/tab_helpers.h"
  27 #include "chrome/common/prerender_messages.h"
  28 #include "chrome/common/render_messages.h"
  29 #include "chrome/common/url_constants.h"
  30 #include "content/public/browser/browser_child_process_host.h"
  31 #include "content/public/browser/browser_thread.h"
  32 #include "content/public/browser/notification_service.h"
  33 #include "content/public/browser/render_frame_host.h"
  34 #include "content/public/browser/render_process_host.h"
  35 #include "content/public/browser/render_view_host.h"
  36 #include "content/public/browser/resource_request_details.h"
  37 #include "content/public/browser/session_storage_namespace.h"
  38 #include "content/public/browser/web_contents.h"
  39 #include "content/public/browser/web_contents_delegate.h"
  40 #include "content/public/common/frame_navigate_params.h"
  41 #include "content/public/common/page_transition_types.h"
  42 #include "net/url_request/url_request_context_getter.h"
  43 #include "ui/gfx/rect.h"
  44
  45 using content::BrowserThread;
  46 using content::DownloadItem;
  47 using content::OpenURLParams;
  48 using content::RenderViewHost;
  49 using content::ResourceRedirectDetails;
  50 using content::ResourceType;
  51 using content::SessionStorageNamespace;
  52 using content::WebContents;
  53
  54 namespace prerender {
  55
  56 namespace {
  57
  58 // Internal cookie event.
  59 // Whenever a prerender interacts with the cookie store, either sending
  60 // existing cookies that existed before the prerender started, or when a cookie
  61 // is changed, we record these events for histogramming purposes.
  62 enum InternalCookieEvent {
  63   INTERNAL_COOKIE_EVENT_MAIN_FRAME_SEND = 0,
  64   INTERNAL_COOKIE_EVENT_MAIN_FRAME_CHANGE = 1,
  65   INTERNAL_COOKIE_EVENT_OTHER_SEND = 2,
  66   INTERNAL_COOKIE_EVENT_OTHER_CHANGE = 3,
  67   INTERNAL_COOKIE_EVENT_MAX
  68 };
  69
  70 // Indicates whether existing cookies were sent, and if they were third party
  71 // cookies, and whether they were for blocking resources.
  72 // Each value may be inclusive of previous values. We only care about the
  73 // value with the highest index that has ever occurred in the course of a
  74 // prerender.
  75 enum CookieSendType {
  76   COOKIE_SEND_TYPE_NONE = 0,
  77   COOKIE_SEND_TYPE_FIRST_PARTY = 1,
  78   COOKIE_SEND_TYPE_THIRD_PARTY = 2,
  79   COOKIE_SEND_TYPE_THIRD_PARTY_BLOCKING_RESOURCE = 3,
  80   COOKIE_SEND_TYPE_MAX
  81 };
  82
  83 void ResumeThrottles(
  84     std::vector<base::WeakPtr<PrerenderResourceThrottle> > throttles) {
  85   for (size_t i = 0; i < throttles.size(); i++) {
  86     if (throttles[i])
  87       throttles[i]->Resume();
  88   }
  89 }
  90
  91 }  // namespace
  92
  93 // static
  94 const int PrerenderContents::kNumCookieStatuses =
  95     (1 << INTERNAL_COOKIE_EVENT_MAX);
  96
  97 // static
  98 const int PrerenderContents::kNumCookieSendTypes = COOKIE_SEND_TYPE_MAX;
  99
 100 class PrerenderContentsFactoryImpl : public PrerenderContents::Factory {
 101  public:
 102   virtual PrerenderContents* CreatePrerenderContents(
 103       PrerenderManager* prerender_manager, Profile* profile,
 104       const GURL& url, const content::Referrer& referrer,
 105       Origin origin, uint8 experiment_id) OVERRIDE {
 106     return new PrerenderContents(prerender_manager, profile,
 107                                  url, referrer, origin, experiment_id);
 108   }
 109 };
 110
 111 // WebContentsDelegateImpl -----------------------------------------------------
 112
 113 class PrerenderContents::WebContentsDelegateImpl
 114     : public content::WebContentsDelegate {
 115  public:
 116   explicit WebContentsDelegateImpl(PrerenderContents* prerender_contents)
 117       : prerender_contents_(prerender_contents) {
 118   }
 119
 120   // content::WebContentsDelegate implementation:
 121   virtual WebContents* OpenURLFromTab(WebContents* source,
 122                                       const OpenURLParams& params) OVERRIDE {
 123     // |OpenURLFromTab| is typically called when a frame performs a navigation
 124     // that requires the browser to perform the transition instead of WebKit.
 125     // Examples include prerendering a site that redirects to an app URL,
 126     // or if --enable-strict-site-isolation is specified and the prerendered
 127     // frame redirects to a different origin.
 128     // TODO(cbentzel): Consider supporting this if it is a common case during
 129     // prerenders.
 130     prerender_contents_->Destroy(FINAL_STATUS_OPEN_URL);
 131     return NULL;
 132   }
 133
 134   virtual void CloseContents(content::WebContents* contents) OVERRIDE {
 135     prerender_contents_->Destroy(FINAL_STATUS_CLOSED);
 136   }
 137
 138   virtual void CanDownload(
 139       RenderViewHost* render_view_host,
 140       const GURL& url,
 141       const std::string& request_method,
 142       const base::Callback<void(bool)>& callback) OVERRIDE {
 143     prerender_contents_->Destroy(FINAL_STATUS_DOWNLOAD);
 144     // Cancel the download.
 145     callback.Run(false);
 146   }
 147
 148    virtual bool ShouldCreateWebContents(
 149        WebContents* web_contents,
 150        int route_id,
 151        WindowContainerType window_container_type,
 152        const base::string16& frame_name,
 153        const GURL& target_url,
 154        const std::string& partition_id,
 155        SessionStorageNamespace* session_storage_namespace) OVERRIDE {
 156     // Since we don't want to permit child windows that would have a
 157     // window.opener property, terminate prerendering.
 158     prerender_contents_->Destroy(FINAL_STATUS_CREATE_NEW_WINDOW);
 159     // Cancel the popup.
 160     return false;
 161   }
 162
 163   virtual bool OnGoToEntryOffset(int offset) OVERRIDE {
 164     // This isn't allowed because the history merge operation
 165     // does not work if there are renderer issued challenges.
 166     // TODO(cbentzel): Cancel in this case? May not need to do
 167     // since render-issued offset navigations are not guaranteed,
 168     // but indicates that the page cares about the history.
 169     return false;
 170   }
 171
 172   virtual bool ShouldSuppressDialogs() OVERRIDE {
 173     // We still want to show the user the message when they navigate to this
 174     // page, so cancel this prerender.
 175     prerender_contents_->Destroy(FINAL_STATUS_JAVASCRIPT_ALERT);
 176     // Always suppress JavaScript messages if they're triggered by a page being
 177     // prerendered.
 178     return true;
 179   }
 180
 181   virtual void RegisterProtocolHandler(WebContents* web_contents,
 182                                        const std::string& protocol,
 183                                        const GURL& url,
 184                                        bool user_gesture) OVERRIDE {
 185     // TODO(mmenke): Consider supporting this if it is a common case during
 186     // prerenders.
 187     prerender_contents_->Destroy(FINAL_STATUS_REGISTER_PROTOCOL_HANDLER);
 188   }
 189
 190   virtual gfx::Size GetSizeForNewRenderView(
 191       WebContents* web_contents) const OVERRIDE {
 192     // Have to set the size of the RenderView on initialization to be sure it is
 193     // set before the RenderView is hidden on all platforms (esp. Android).
 194     return prerender_contents_->size_;
 195   }
 196
 197  private:
 198   PrerenderContents* prerender_contents_;
 199 };
 200
 201 void PrerenderContents::Observer::OnPrerenderStopLoading(
 202     PrerenderContents* contents) {
 203 }
 204
 205 void PrerenderContents::Observer::OnPrerenderDomContentLoaded(
 206     PrerenderContents* contents) {
 207 }
 208
 209 void PrerenderContents::Observer::OnPrerenderCreatedMatchCompleteReplacement(
 210     PrerenderContents* contents, PrerenderContents* replacement) {
 211 }
 212
 213 PrerenderContents::Observer::Observer() {
 214 }
 215
 216 PrerenderContents::Observer::~Observer() {
 217 }
 218
 219 PrerenderContents::PrerenderContents(
 220     PrerenderManager* prerender_manager,
 221     Profile* profile,
 222     const GURL& url,
 223     const content::Referrer& referrer,
 224     Origin origin,
 225     uint8 experiment_id)
 226     : prerendering_has_started_(false),
 227       session_storage_namespace_id_(-1),
 228       prerender_manager_(prerender_manager),
 229       prerender_url_(url),
 230       referrer_(referrer),
 231       profile_(profile),
 232       page_id_(0),
 233       has_stopped_loading_(false),
 234       has_finished_loading_(false),
 235       final_status_(FINAL_STATUS_MAX),
 236       match_complete_status_(MATCH_COMPLETE_DEFAULT),
 237       prerendering_has_been_cancelled_(false),
 238       child_id_(-1),
 239       route_id_(-1),
 240       origin_(origin),
 241       experiment_id_(experiment_id),
 242       creator_child_id_(-1),
 243       cookie_status_(0),
 244       cookie_send_type_(COOKIE_SEND_TYPE_NONE),
 245       network_bytes_(0) {
 246   DCHECK(prerender_manager != NULL);
 247 }
 248
 249 PrerenderContents* PrerenderContents::CreateMatchCompleteReplacement() {
 250   PrerenderContents* new_contents = prerender_manager_->CreatePrerenderContents(
 251       prerender_url(), referrer(), origin(), experiment_id());
 252
 253   new_contents->load_start_time_ = load_start_time_;
 254   new_contents->session_storage_namespace_id_ = session_storage_namespace_id_;
 255   new_contents->set_match_complete_status(
 256       PrerenderContents::MATCH_COMPLETE_REPLACEMENT_PENDING);
 257
 258   const bool did_init = new_contents->Init();
 259   DCHECK(did_init);
 260   DCHECK_EQ(alias_urls_.front(), new_contents->alias_urls_.front());
 261   DCHECK_EQ(1u, new_contents->alias_urls_.size());
 262   new_contents->alias_urls_ = alias_urls_;
 263   // Erase all but the first alias URL; the replacement has adopted the
 264   // remainder without increasing the renderer-side reference count.
 265   alias_urls_.resize(1);
 266   new_contents->set_match_complete_status(
 267       PrerenderContents::MATCH_COMPLETE_REPLACEMENT);
 268   NotifyPrerenderCreatedMatchCompleteReplacement(new_contents);
 269   return new_contents;
 270 }
 271
 272 bool PrerenderContents::Init() {
 273   return AddAliasURL(prerender_url_);
 274 }
 275
 276 // static
 277 PrerenderContents::Factory* PrerenderContents::CreateFactory() {
 278   return new PrerenderContentsFactoryImpl();
 279 }
 280
 281 // static
 282 PrerenderContents* PrerenderContents::FromWebContents(
 283     content::WebContents* web_contents) {
 284   if (!web_contents)
 285     return NULL;
 286   PrerenderManager* prerender_manager = PrerenderManagerFactory::GetForProfile(
 287       Profile::FromBrowserContext(web_contents->GetBrowserContext()));
 288   if (!prerender_manager)
 289     return NULL;
 290   return prerender_manager->GetPrerenderContents(web_contents);
 291 }
 292
 293 void PrerenderContents::StartPrerendering(
 294     int creator_child_id,
 295     const gfx::Size& size,
 296     SessionStorageNamespace* session_storage_namespace,
 297     net::URLRequestContextGetter* request_context) {
 298   DCHECK(profile_ != NULL);
 299   DCHECK(!size.IsEmpty());
 300   DCHECK(!prerendering_has_started_);
 301   DCHECK(prerender_contents_.get() == NULL);
 302   DCHECK_EQ(-1, creator_child_id_);
 303   DCHECK(size_.IsEmpty());
 304   DCHECK_EQ(1U, alias_urls_.size());
 305
 306   creator_child_id_ = creator_child_id;
 307   session_storage_namespace_id_ = session_storage_namespace->id();
 308   size_ = size;
 309
 310   DCHECK(load_start_time_.is_null());
 311   load_start_time_ = base::TimeTicks::Now();
 312   start_time_ = base::Time::Now();
 313
 314   // Everything after this point sets up the WebContents object and associated
 315   // RenderView for the prerender page. Don't do this for members of the
 316   // control group.
 317   if (prerender_manager_->IsControlGroup(experiment_id()))
 318     return;
 319
 320   if (origin_ == ORIGIN_LOCAL_PREDICTOR &&
 321       IsLocalPredictorPrerenderAlwaysControlEnabled()) {
 322     return;
 323   }
 324
 325   prerendering_has_started_ = true;
 326
 327   alias_session_storage_namespace = session_storage_namespace->CreateAlias();
 328   prerender_contents_.reset(
 329       CreateWebContents(alias_session_storage_namespace.get()));
 330   TabHelpers::AttachTabHelpers(prerender_contents_.get());
 331   content::WebContentsObserver::Observe(prerender_contents_.get());
 332
 333   web_contents_delegate_.reset(new WebContentsDelegateImpl(this));
 334   prerender_contents_.get()->SetDelegate(web_contents_delegate_.get());
 335   // Set the size of the prerender WebContents.
 336   apps::ResizeWebContents(prerender_contents_.get(), size_);
 337
 338   child_id_ = GetRenderViewHost()->GetProcess()->GetID();
 339   route_id_ = GetRenderViewHost()->GetRoutingID();
 340
 341   // Log transactions to see if we could merge session storage namespaces in
 342   // the event of a mismatch.
 343   alias_session_storage_namespace->AddTransactionLogProcessId(child_id_);
 344
 345   // Add the RenderProcessHost to the Prerender Manager.
 346   prerender_manager()->AddPrerenderProcessHost(
 347       GetRenderViewHost()->GetProcess());
 348
 349   // In the prerender tracker, create a Prerender Cookie Store to keep track of
 350   // cookie changes performed by the prerender. Once the prerender is shown,
 351   // the cookie changes will be committed to the actual cookie store,
 352   // otherwise, they will be discarded.
 353   // If |request_context| is NULL, the feature must be disabled, so the
 354   // operation will not be performed.
 355   if (request_context) {
 356     BrowserThread::PostTask(
 357         BrowserThread::IO, FROM_HERE,
 358         base::Bind(&PrerenderTracker::AddPrerenderCookieStoreOnIOThread,
 359                    base::Unretained(prerender_manager()->prerender_tracker()),
 360                    GetRenderViewHost()->GetProcess()->GetID(),
 361                    make_scoped_refptr(request_context),
 362                    base::Bind(&PrerenderContents::Destroy,
 363                               AsWeakPtr(),
 364                               FINAL_STATUS_COOKIE_CONFLICT)));
 365   }
 366
 367   NotifyPrerenderStart();
 368
 369   // Close ourselves when the application is shutting down.
 370   notification_registrar_.Add(this, chrome::NOTIFICATION_APP_TERMINATING,
 371                               content::NotificationService::AllSources());
 372
 373   // Register to inform new RenderViews that we're prerendering.
 374   notification_registrar_.Add(
 375       this, content::NOTIFICATION_WEB_CONTENTS_RENDER_VIEW_HOST_CREATED,
 376       content::Source<WebContents>(prerender_contents_.get()));
 377
 378   // Transfer over the user agent override.
 379   prerender_contents_.get()->SetUserAgentOverride(
 380       prerender_manager_->config().user_agent_override);
 381
 382   content::NavigationController::LoadURLParams load_url_params(
 383       prerender_url_);
 384   load_url_params.referrer = referrer_;
 385   load_url_params.transition_type = content::PAGE_TRANSITION_LINK;
 386   if (origin_ == ORIGIN_OMNIBOX) {
 387     load_url_params.transition_type = content::PageTransitionFromInt(
 388         content::PAGE_TRANSITION_TYPED |
 389         content::PAGE_TRANSITION_FROM_ADDRESS_BAR);
 390   } else if (origin_ == ORIGIN_INSTANT) {
 391     load_url_params.transition_type = content::PageTransitionFromInt(
 392         content::PAGE_TRANSITION_GENERATED |
 393         content::PAGE_TRANSITION_FROM_ADDRESS_BAR);
 394   }
 395   load_url_params.override_user_agent =
 396       prerender_manager_->config().is_overriding_user_agent ?
 397       content::NavigationController::UA_OVERRIDE_TRUE :
 398       content::NavigationController::UA_OVERRIDE_FALSE;
 399   prerender_contents_.get()->GetController().LoadURLWithParams(load_url_params);
 400 }
 401
 402 bool PrerenderContents::GetChildId(int* child_id) const {
 403   CHECK(child_id);
 404   DCHECK_GE(child_id_, -1);
 405   *child_id = child_id_;
 406   return child_id_ != -1;
 407 }
 408
 409 bool PrerenderContents::GetRouteId(int* route_id) const {
 410   CHECK(route_id);
 411   DCHECK_GE(route_id_, -1);
 412   *route_id = route_id_;
 413   return route_id_ != -1;
 414 }
 415
 416 void PrerenderContents::SetFinalStatus(FinalStatus final_status) {
 417   DCHECK_GE(final_status, FINAL_STATUS_USED);
 418   DCHECK_LT(final_status, FINAL_STATUS_MAX);
 419
 420   DCHECK_EQ(FINAL_STATUS_MAX, final_status_);
 421
 422   final_status_ = final_status;
 423 }
 424
 425 PrerenderContents::~PrerenderContents() {
 426   DCHECK_NE(FINAL_STATUS_MAX, final_status());
 427   DCHECK(
 428       prerendering_has_been_cancelled() || final_status() == FINAL_STATUS_USED);
 429   DCHECK_NE(ORIGIN_MAX, origin());
 430   // Since a lot of prerenders terminate before any meaningful cookie action
 431   // would have happened, only record the cookie status for prerenders who
 432   // were used, cancelled, or timed out.
 433   if (prerendering_has_started_ && final_status() == FINAL_STATUS_USED) {
 434     prerender_manager_->RecordCookieStatus(origin(), experiment_id(),
 435                                            cookie_status_);
 436     prerender_manager_->RecordCookieSendType(origin(), experiment_id(),
 437                                              cookie_send_type_);
 438   }
 439   prerender_manager_->RecordFinalStatusWithMatchCompleteStatus(
 440       origin(), experiment_id(), match_complete_status(), final_status());
 441
 442   bool used = final_status() == FINAL_STATUS_USED ||
 443               final_status() == FINAL_STATUS_WOULD_HAVE_BEEN_USED;
 444   prerender_manager_->RecordNetworkBytes(origin(), used, network_bytes_);
 445
 446   // Broadcast the removal of aliases.
 447   for (content::RenderProcessHost::iterator host_iterator =
 448            content::RenderProcessHost::AllHostsIterator();
 449        !host_iterator.IsAtEnd();
 450        host_iterator.Advance()) {
 451     content::RenderProcessHost* host = host_iterator.GetCurrentValue();
 452     host->Send(new PrerenderMsg_OnPrerenderRemoveAliases(alias_urls_));
 453   }
 454
 455   // If we still have a WebContents, clean up anything we need to and then
 456   // destroy it.
 457   if (prerender_contents_.get())
 458     delete ReleasePrerenderContents();
 459 }
 460
 461 void PrerenderContents::AddObserver(Observer* observer) {
 462   DCHECK_EQ(FINAL_STATUS_MAX, final_status_);
 463   observer_list_.AddObserver(observer);
 464 }
 465
 466 void PrerenderContents::RemoveObserver(Observer* observer) {
 467   observer_list_.RemoveObserver(observer);
 468 }
 469
 470 void PrerenderContents::Observe(int type,
 471                                 const content::NotificationSource& source,
 472                                 const content::NotificationDetails& details) {
 473   switch (type) {
 474     // TODO(davidben): Try to remove this in favor of relying on
 475     // FINAL_STATUS_PROFILE_DESTROYED.
 476     case chrome::NOTIFICATION_APP_TERMINATING:
 477       Destroy(FINAL_STATUS_APP_TERMINATING);
 478       return;
 479
 480     case content::NOTIFICATION_WEB_CONTENTS_RENDER_VIEW_HOST_CREATED: {
 481       if (prerender_contents_.get()) {
 482         DCHECK_EQ(content::Source<WebContents>(source).ptr(),
 483                   prerender_contents_.get());
 484
 485         content::Details<RenderViewHost> new_render_view_host(details);
 486         OnRenderViewHostCreated(new_render_view_host.ptr());
 487
 488         // Make sure the size of the RenderViewHost has been passed to the new
 489         // RenderView.  Otherwise, the size may not be sent until the
 490         // RenderViewReady event makes it from the render process to the UI
 491         // thread of the browser process.  When the RenderView receives its
 492         // size, is also sets itself to be visible, which would then break the
 493         // visibility API.
 494         new_render_view_host->WasResized();
 495         prerender_contents_->WasHidden();
 496       }
 497       break;
 498     }
 499
 500     default:
 501       NOTREACHED() << "Unexpected notification sent.";
 502       break;
 503   }
 504 }
 505
 506 void PrerenderContents::OnRenderViewHostCreated(
 507     RenderViewHost* new_render_view_host) {
 508 }
 509
 510 WebContents* PrerenderContents::CreateWebContents(
 511     SessionStorageNamespace* session_storage_namespace) {
 512   // TODO(ajwong): Remove the temporary map once prerendering is aware of
 513   // multiple session storage namespaces per tab.
 514   content::SessionStorageNamespaceMap session_storage_namespace_map;
 515   session_storage_namespace_map[std::string()] = session_storage_namespace;
 516   return WebContents::CreateWithSessionStorage(
 517       WebContents::CreateParams(profile_), session_storage_namespace_map);
 518 }
 519
 520 void PrerenderContents::NotifyPrerenderStart() {
 521   DCHECK_EQ(FINAL_STATUS_MAX, final_status_);
 522   FOR_EACH_OBSERVER(Observer, observer_list_, OnPrerenderStart(this));
 523 }
 524
 525 void PrerenderContents::NotifyPrerenderStopLoading() {
 526   FOR_EACH_OBSERVER(Observer, observer_list_, OnPrerenderStopLoading(this));
 527 }
 528
 529 void PrerenderContents::NotifyPrerenderDomContentLoaded() {
 530   FOR_EACH_OBSERVER(Observer, observer_list_,
 531                     OnPrerenderDomContentLoaded(this));
 532 }
 533
 534 void PrerenderContents::NotifyPrerenderStop() {
 535   DCHECK_NE(FINAL_STATUS_MAX, final_status_);
 536   FOR_EACH_OBSERVER(Observer, observer_list_, OnPrerenderStop(this));
 537   observer_list_.Clear();
 538 }
 539
 540 void PrerenderContents::NotifyPrerenderCreatedMatchCompleteReplacement(
 541     PrerenderContents* replacement) {
 542   FOR_EACH_OBSERVER(Observer, observer_list_,
 543                     OnPrerenderCreatedMatchCompleteReplacement(this,
 544                                                                replacement));
 545 }
 546
 547 bool PrerenderContents::OnMessageReceived(const IPC::Message& message) {
 548   bool handled = true;
 549   // The following messages we do want to consume.
 550   IPC_BEGIN_MESSAGE_MAP(PrerenderContents, message)
 551     IPC_MESSAGE_HANDLER(ChromeViewHostMsg_CancelPrerenderForPrinting,
 552                         OnCancelPrerenderForPrinting)
 553     IPC_MESSAGE_UNHANDLED(handled = false)
 554   IPC_END_MESSAGE_MAP()
 555
 556   return handled;
 557 }
 558
 559 bool PrerenderContents::CheckURL(const GURL& url) {
 560   if (!url.SchemeIsHTTPOrHTTPS()) {
 561     DCHECK_NE(MATCH_COMPLETE_REPLACEMENT_PENDING, match_complete_status_);
 562     Destroy(FINAL_STATUS_UNSUPPORTED_SCHEME);
 563     return false;
 564   }
 565   if (match_complete_status_ != MATCH_COMPLETE_REPLACEMENT_PENDING &&
 566       prerender_manager_->HasRecentlyBeenNavigatedTo(origin(), url)) {
 567     Destroy(FINAL_STATUS_RECENTLY_VISITED);
 568     return false;
 569   }
 570   return true;
 571 }
 572
 573 bool PrerenderContents::AddAliasURL(const GURL& url) {
 574   if (!CheckURL(url))
 575     return false;
 576
 577   alias_urls_.push_back(url);
 578
 579   for (content::RenderProcessHost::iterator host_iterator =
 580            content::RenderProcessHost::AllHostsIterator();
 581        !host_iterator.IsAtEnd();
 582        host_iterator.Advance()) {
 583     content::RenderProcessHost* host = host_iterator.GetCurrentValue();
 584     host->Send(new PrerenderMsg_OnPrerenderAddAlias(url));
 585   }
 586
 587   return true;
 588 }
 589
 590 bool PrerenderContents::Matches(
 591     const GURL& url,
 592     const SessionStorageNamespace* session_storage_namespace) const {
 593   if (session_storage_namespace &&
 594       session_storage_namespace_id_ != session_storage_namespace->id()) {
 595     return false;
 596   }
 597   return std::count_if(alias_urls_.begin(), alias_urls_.end(),
 598                        std::bind2nd(std::equal_to<GURL>(), url)) != 0;
 599 }
 600
 601 void PrerenderContents::RenderProcessGone(base::TerminationStatus status) {
 602   Destroy(FINAL_STATUS_RENDERER_CRASHED);
 603 }
 604
 605 void PrerenderContents::RenderFrameCreated(
 606     content::RenderFrameHost* render_frame_host) {
 607   // When a new RenderFrame is created for a prerendering WebContents, tell the
 608   // new RenderFrame it's being used for prerendering before any navigations
 609   // occur.  Note that this is always triggered before the first navigation, so
 610   // there's no need to send the message just after the WebContents is created.
 611   render_frame_host->Send(new PrerenderMsg_SetIsPrerendering(
 612       render_frame_host->GetRoutingID(), true));
 613 }
 614
 615 void PrerenderContents::DidStopLoading(
 616     content::RenderViewHost* render_view_host) {
 617   has_stopped_loading_ = true;
 618   NotifyPrerenderStopLoading();
 619 }
 620
 621 void PrerenderContents::DocumentLoadedInFrame(
 622     content::RenderFrameHost* render_frame_host) {
 623   if (!render_frame_host->GetParent())
 624     NotifyPrerenderDomContentLoaded();
 625 }
 626
 627 void PrerenderContents::DidStartProvisionalLoadForFrame(
 628     content::RenderFrameHost* render_frame_host,
 629     const GURL& validated_url,
 630     bool is_error_page,
 631     bool is_iframe_srcdoc) {
 632   if (!render_frame_host->GetParent()) {
 633     if (!CheckURL(validated_url))
 634       return;
 635
 636     // Usually, this event fires if the user clicks or enters a new URL.
 637     // Neither of these can happen in the case of an invisible prerender.
 638     // So the cause is: Some JavaScript caused a new URL to be loaded.  In that
 639     // case, the spinner would start again in the browser, so we must reset
 640     // has_stopped_loading_ so that the spinner won't be stopped.
 641     has_stopped_loading_ = false;
 642     has_finished_loading_ = false;
 643   }
 644 }
 645
 646 void PrerenderContents::DidFinishLoad(
 647     content::RenderFrameHost* render_frame_host,
 648     const GURL& validated_url) {
 649   if (!render_frame_host->GetParent())
 650     has_finished_loading_ = true;
 651 }
 652
 653 void PrerenderContents::DidNavigateMainFrame(
 654     const content::LoadCommittedDetails& details,
 655     const content::FrameNavigateParams& params) {
 656   // If the prerender made a second navigation entry, abort the prerender. This
 657   // avoids having to correctly implement a complex history merging case (this
 658   // interacts with location.replace) and correctly synchronize with the
 659   // renderer. The final status may be monitored to see we need to revisit this
 660   // decision. This does not affect client redirects as those do not push new
 661   // history entries. (Calls to location.replace, navigations before onload, and
 662   // <meta http-equiv=refresh> with timeouts under 1 second do not create
 663   // entries in Blink.)
 664   if (prerender_contents_->GetController().GetEntryCount() > 1) {
 665     Destroy(FINAL_STATUS_NEW_NAVIGATION_ENTRY);
 666     return;
 667   }
 668
 669   // Add each redirect as an alias. |params.url| is included in
 670   // |params.redirects|.
 671   //
 672   // TODO(davidben): We do not correctly patch up history for renderer-initated
 673   // navigations which add history entries. http://crbug.com/305660.
 674   for (size_t i = 0; i < params.redirects.size(); i++) {
 675     if (!AddAliasURL(params.redirects[i]))
 676       return;
 677   }
 678 }
 679
 680 void PrerenderContents::DidGetRedirectForResourceRequest(
 681     RenderViewHost* render_view_host,
 682     const content::ResourceRedirectDetails& details) {
 683   // DidGetRedirectForResourceRequest can come for any resource on a page.  If
 684   // it's a redirect on the top-level resource, the name needs to be remembered
 685   // for future matching, and if it redirects to an https resource, it needs to
 686   // be canceled. If a subresource is redirected, nothing changes.
 687   if (details.resource_type != content::RESOURCE_TYPE_MAIN_FRAME)
 688     return;
 689   CheckURL(details.new_url);
 690 }
 691
 692 void PrerenderContents::Destroy(FinalStatus final_status) {
 693   DCHECK_NE(final_status, FINAL_STATUS_USED);
 694
 695   if (prerendering_has_been_cancelled_)
 696     return;
 697
 698   SetFinalStatus(final_status);
 699
 700   prerendering_has_been_cancelled_ = true;
 701   prerender_manager_->AddToHistory(this);
 702   prerender_manager_->MoveEntryToPendingDelete(this, final_status);
 703
 704   // Note that if this PrerenderContents was made into a MatchComplete
 705   // replacement by MoveEntryToPendingDelete, NotifyPrerenderStop will
 706   // not reach the PrerenderHandle. Rather
 707   // OnPrerenderCreatedMatchCompleteReplacement will propogate that
 708   // information to the referer.
 709   if (!prerender_manager_->IsControlGroup(experiment_id()) &&
 710       (prerendering_has_started() ||
 711        match_complete_status() == MATCH_COMPLETE_REPLACEMENT)) {
 712     NotifyPrerenderStop();
 713   }
 714 }
 715
 716 base::ProcessMetrics* PrerenderContents::MaybeGetProcessMetrics() {
 717   if (process_metrics_.get() == NULL) {
 718     // If a PrenderContents hasn't started prerending, don't be fully formed.
 719     if (!GetRenderViewHost() || !GetRenderViewHost()->GetProcess())
 720       return NULL;
 721     base::ProcessHandle handle = GetRenderViewHost()->GetProcess()->GetHandle();
 722     if (handle == base::kNullProcessHandle)
 723       return NULL;
 724 #if !defined(OS_MACOSX)
 725     process_metrics_.reset(base::ProcessMetrics::CreateProcessMetrics(handle));
 726 #else
 727     process_metrics_.reset(base::ProcessMetrics::CreateProcessMetrics(
 728         handle,
 729         content::BrowserChildProcessHost::GetPortProvider()));
 730 #endif
 731   }
 732
 733   return process_metrics_.get();
 734 }
 735
 736 void PrerenderContents::DestroyWhenUsingTooManyResources() {
 737   base::ProcessMetrics* metrics = MaybeGetProcessMetrics();
 738   if (metrics == NULL)
 739     return;
 740
 741   size_t private_bytes, shared_bytes;
 742   if (metrics->GetMemoryBytes(&private_bytes, &shared_bytes) &&
 743       private_bytes > prerender_manager_->config().max_bytes) {
 744     Destroy(FINAL_STATUS_MEMORY_LIMIT_EXCEEDED);
 745   }
 746 }
 747
 748 WebContents* PrerenderContents::ReleasePrerenderContents() {
 749   prerender_contents_->SetDelegate(NULL);
 750   content::WebContentsObserver::Observe(NULL);
 751   if (alias_session_storage_namespace)
 752     alias_session_storage_namespace->RemoveTransactionLogProcessId(child_id_);
 753   return prerender_contents_.release();
 754 }
 755
 756 RenderViewHost* PrerenderContents::GetRenderViewHostMutable() {
 757   return const_cast<RenderViewHost*>(GetRenderViewHost());
 758 }
 759
 760 const RenderViewHost* PrerenderContents::GetRenderViewHost() const {
 761   if (!prerender_contents_.get())
 762     return NULL;
 763   return prerender_contents_->GetRenderViewHost();
 764 }
 765
 766 void PrerenderContents::DidNavigate(
 767     const history::HistoryAddPageArgs& add_page_args) {
 768   add_page_vector_.push_back(add_page_args);
 769 }
 770
 771 void PrerenderContents::CommitHistory(WebContents* tab) {
 772   HistoryTabHelper* history_tab_helper = HistoryTabHelper::FromWebContents(tab);
 773   for (size_t i = 0; i < add_page_vector_.size(); ++i)
 774     history_tab_helper->UpdateHistoryForNavigation(add_page_vector_[i]);
 775 }
 776
 777 base::Value* PrerenderContents::GetAsValue() const {
 778   if (!prerender_contents_.get())
 779     return NULL;
 780   base::DictionaryValue* dict_value = new base::DictionaryValue();
 781   dict_value->SetString("url", prerender_url_.spec());
 782   base::TimeTicks current_time = base::TimeTicks::Now();
 783   base::TimeDelta duration = current_time - load_start_time_;
 784   dict_value->SetInteger("duration", duration.InSeconds());
 785   dict_value->SetBoolean("is_loaded", prerender_contents_ &&
 786                                       !prerender_contents_->IsLoading());
 787   return dict_value;
 788 }
 789
 790 bool PrerenderContents::IsCrossSiteNavigationPending() const {
 791   if (!prerender_contents_)
 792     return false;
 793   return (prerender_contents_->GetSiteInstance() !=
 794           prerender_contents_->GetPendingSiteInstance());
 795 }
 796
 797 void PrerenderContents::PrepareForUse() {
 798   SetFinalStatus(FINAL_STATUS_USED);
 799
 800   if (prerender_contents_.get()) {
 801     prerender_contents_->SendToAllFrames(
 802         new PrerenderMsg_SetIsPrerendering(MSG_ROUTING_NONE, false));
 803   }
 804
 805   NotifyPrerenderStop();
 806
 807   BrowserThread::PostTask(
 808       BrowserThread::IO,
 809       FROM_HERE,
 810       base::Bind(&ResumeThrottles, resource_throttles_));
 811   resource_throttles_.clear();
 812 }
 813
 814 SessionStorageNamespace* PrerenderContents::GetSessionStorageNamespace() const {
 815   if (!prerender_contents())
 816     return NULL;
 817   return prerender_contents()->GetController().
 818       GetDefaultSessionStorageNamespace();
 819 }
 820
 821 void PrerenderContents::OnCancelPrerenderForPrinting() {
 822   Destroy(FINAL_STATUS_WINDOW_PRINT);
 823 }
 824
 825 void PrerenderContents::RecordCookieEvent(CookieEvent event,
 826                                           bool is_main_frame_http_request,
 827                                           bool is_third_party_cookie,
 828                                           bool is_for_blocking_resource,
 829                                           base::Time earliest_create_date) {
 830   // We don't care about sent cookies that were created after this prerender
 831   // started.
 832   // The reason is that for the purpose of the histograms emitted, we only care
 833   // about cookies that existed before the prerender was started, but not
 834   // about cookies that were created as part of the prerender. Using the
 835   // earliest creation timestamp of all cookies provided by the cookie monster
 836   // is a heuristic that yields the desired result pretty closely.
 837   // In particular, we pretend no other WebContents make changes to the cookies
 838   // relevant to the prerender, which may not actually always be the case, but
 839   // hopefully most of the times.
 840   if (event == COOKIE_EVENT_SEND && earliest_create_date > start_time_)
 841     return;
 842
 843   InternalCookieEvent internal_event = INTERNAL_COOKIE_EVENT_MAX;
 844
 845   if (is_main_frame_http_request) {
 846     if (event == COOKIE_EVENT_SEND) {
 847       internal_event = INTERNAL_COOKIE_EVENT_MAIN_FRAME_SEND;
 848     } else {
 849       internal_event = INTERNAL_COOKIE_EVENT_MAIN_FRAME_CHANGE;
 850     }
 851   } else {
 852     if (event == COOKIE_EVENT_SEND) {
 853       internal_event = INTERNAL_COOKIE_EVENT_OTHER_SEND;
 854     } else {
 855       internal_event = INTERNAL_COOKIE_EVENT_OTHER_CHANGE;
 856     }
 857   }
 858
 859   DCHECK_GE(internal_event, 0);
 860   DCHECK_LT(internal_event, INTERNAL_COOKIE_EVENT_MAX);
 861
 862   cookie_status_ |= (1 << internal_event);
 863
 864   DCHECK_GE(cookie_status_, 0);
 865   DCHECK_LT(cookie_status_, kNumCookieStatuses);
 866
 867   CookieSendType send_type = COOKIE_SEND_TYPE_NONE;
 868   if (event == COOKIE_EVENT_SEND) {
 869     if (!is_third_party_cookie) {
 870       send_type = COOKIE_SEND_TYPE_FIRST_PARTY;
 871     } else {
 872       if (is_for_blocking_resource) {
 873         send_type = COOKIE_SEND_TYPE_THIRD_PARTY_BLOCKING_RESOURCE;
 874       } else {
 875         send_type = COOKIE_SEND_TYPE_THIRD_PARTY;
 876       }
 877     }
 878   }
 879   DCHECK_GE(send_type, 0);
 880   DCHECK_LT(send_type, COOKIE_SEND_TYPE_MAX);
 881
 882   if (cookie_send_type_ < send_type)
 883     cookie_send_type_ = send_type;
 884 }
 885
 886  void PrerenderContents::AddResourceThrottle(
 887      const base::WeakPtr<PrerenderResourceThrottle>& throttle) {
 888    resource_throttles_.push_back(throttle);
 889  }
 890
 891  void PrerenderContents::AddNetworkBytes(int64 bytes) {
 892    network_bytes_ += bytes;
 893  }
 894
 895 }  // namespace prerender