Prerendered pages are swapped in at browser::Navigate time.

chrome/renderer/chrome_content_renderer_client.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/renderer/chrome_content_renderer_client.h"
 
 #include <string>
 
 #include "base/command_line.h"
 #include "base/logging.h"
@@ skipping 31 matching lines @@
 #include "chrome/renderer/extensions/miscellaneous_bindings.h"
 #include "chrome/renderer/extensions/schema_generated_bindings.h"
 #include "chrome/renderer/external_extension.h"
 #include "chrome/renderer/loadtimes_extension_bindings.h"
 #include "chrome/renderer/localized_error.h"
 #include "chrome/renderer/net/renderer_net_predictor.h"
 #include "chrome/renderer/page_click_tracker.h"
 #include "chrome/renderer/page_load_histograms.h"
 #include "chrome/renderer/plugins/plugin_placeholder.h"
 #include "chrome/renderer/plugins/plugin_uma.h"
+#include "chrome/renderer/prerender/prerender_dispatcher.h"
 #include "chrome/renderer/prerender/prerender_helper.h"
 #include "chrome/renderer/prerender/prerender_webmediaplayer.h"
 #include "chrome/renderer/print_web_view_helper.h"
 #include "chrome/renderer/renderer_histogram_snapshots.h"
 #include "chrome/renderer/safe_browsing/malware_dom_details.h"
 #include "chrome/renderer/safe_browsing/phishing_classifier_delegate.h"
 #include "chrome/renderer/search_extension.h"
 #include "chrome/renderer/searchbox.h"
 #include "chrome/renderer/searchbox_extension.h"
 #include "chrome/renderer/spellchecker/spellcheck.h"
@@ skipping 101 matching lines @@
 void ChromeContentRendererClient::RenderThreadStarted() {
   chrome_observer_.reset(new ChromeRenderProcessObserver(this));
   extension_dispatcher_.reset(new ExtensionDispatcher());
   histogram_snapshots_.reset(new RendererHistogramSnapshots());
   net_predictor_.reset(new RendererNetPredictor());
   spellcheck_.reset(new SpellCheck());
   visited_link_slave_.reset(new VisitedLinkSlave());
 #if defined(ENABLE_SAFE_BROWSING)
   phishing_classifier_.reset(safe_browsing::PhishingClassifierFilter::Create());
 #endif
+  prerender_dispatcher_.reset(new prerender::PrerenderDispatcher());
 
   RenderThread* thread = RenderThread::Get();
 
   thread->AddObserver(chrome_observer_.get());
   thread->AddObserver(extension_dispatcher_.get());
   thread->AddObserver(histogram_snapshots_.get());
 #if defined(ENABLE_SAFE_BROWSING)
   thread->AddObserver(phishing_classifier_.get());
 #endif
   thread->AddObserver(spellcheck_.get());
   thread->AddObserver(visited_link_slave_.get());
+  thread->AddObserver(prerender_dispatcher_.get());
 
   thread->RegisterExtension(extensions_v8::ExternalExtension::Get());
   thread->RegisterExtension(extensions_v8::LoadTimesExtension::Get());
   thread->RegisterExtension(extensions_v8::SearchBoxExtension::Get());
   v8::Extension* search_extension = extensions_v8::SearchExtension::Get();
   // search_extension is null if not enabled.
   if (search_extension)
     thread->RegisterExtension(search_extension);
 
   if (CommandLine::ForCurrentProcess()->HasSwitch(
@@ skipping 442 matching lines @@
   ChromeV8Context* current_context =
       extension_dispatcher_->v8_context_set().GetCurrent();
   return current_context && !current_context->extension_id().empty();
 }
 
 bool ChromeContentRendererClient::ShouldFork(WebFrame* frame,
                                              const GURL& url,
                                              bool is_content_initiated,
                                              bool is_initial_navigation,
                                              bool* send_referrer) {
+  DCHECK(!frame->parent());
+  DCHECK(is_content_initiated);
+
+  // If |url| matches one of the prerendered URLs, stop this navigation and try
+  // to swap in the prerendered page on the browser process. If the prerendered

[dominich, 2012/02/29 18:32:01]

If the prerender swap fails for some reason, will the navigate somehow continue
successfully anyway? I'm a bit unclear on the logic here.

+  // page no longer exists by the time the OpenURL IPC is handled, a normal
+  // navigation is attempted.
+  if (prerender_dispatcher_->IsPrerenderURL(url))
+    return true;
+
   const ExtensionSet* extensions = extension_dispatcher_->extensions();
 
   // Determine if the new URL is an extension (excluding bookmark apps).
   const Extension* new_url_extension = extensions::GetNonBookmarkAppExtension(
       *extensions, ExtensionURLInfo(url));
   bool is_extension_url = !!new_url_extension;
 
   // If the navigation would cross an app extent boundary, we also need
   // to defer to the browser to ensure process isolation.
   // TODO(erikkay) This is happening inside of a check to is_content_initiated
@@ skipping 200 matching lines @@
     webkit::ppapi::PpapiInterfaceFactoryManager* factory_manager) {
   factory_manager->RegisterFactory(ChromePPAPIInterfaceFactory);
 }
 
 bool ChromeContentRendererClient::AllowSocketAPI(const GURL& url) {
   return allowed_socket_origins_.find(url.host()) !=
       allowed_socket_origins_.end();
 }
 
 }  // namespace chrome