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diff --git a/content/browser/renderer_host/browser_render_process_host.h b/content/browser/renderer_host/browser_render_process_host.h
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+// Copyright (c) 2011 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.
+
+#ifndef CONTENT_BROWSER_RENDERER_HOST_BROWSER_RENDER_PROCESS_HOST_H_
+#define CONTENT_BROWSER_RENDERER_HOST_BROWSER_RENDER_PROCESS_HOST_H_
+#pragma once
+
+#include <map>
+#include <queue>
+#include <string>
+
+#include "base/memory/scoped_callback_factory.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/platform_file.h"
+#include "base/process.h"
+#include "base/timer.h"
+#include "chrome/common/extensions/extension.h"
+#include "content/browser/child_process_launcher.h"
+#include "content/browser/renderer_host/render_process_host.h"
+#include "content/common/notification_observer.h"
+#include "content/common/notification_registrar.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebCache.h"
+#include "ui/gfx/surface/transport_dib.h"
+
+class CommandLine;
+class RendererMainThread;
+class RenderWidgetHelper;
+class VisitedLinkUpdater;
+
+namespace base {
+class SharedMemory;
+}
+
+// Implements a concrete RenderProcessHost for the browser process for talking
+// to actual renderer processes (as opposed to mocks).
+//
+// Represents the browser side of the browser <--> renderer communication
+// channel. There will be one RenderProcessHost per renderer process.
+//
+// This object is refcounted so that it can release its resources when all
+// hosts using it go away.
+//
+// This object communicates back and forth with the RenderProcess object
+// running in the renderer process. Each RenderProcessHost and RenderProcess
+// keeps a list of RenderView (renderer) and TabContents (browser) which
+// are correlated with IDs. This way, the Views and the corresponding ViewHosts
+// communicate through the two process objects.
+class BrowserRenderProcessHost : public RenderProcessHost,
+                                 public NotificationObserver,
+                                 public ChildProcessLauncher::Client {
+ public:
+  explicit BrowserRenderProcessHost(Profile* profile);
+  ~BrowserRenderProcessHost();
+
+  // Whether this process is associated with an installed app.
+  const Extension* installed_app() const { return installed_app_; }
+  void set_installed_app(const Extension* installed_app) {
+    installed_app_ = installed_app;
+  }
+
+  // RenderProcessHost implementation (public portion).
+  virtual bool Init(bool is_accessibility_enabled, bool is_extensions_process);
+  virtual int GetNextRoutingID();
+  virtual void CancelResourceRequests(int render_widget_id);
+  virtual void CrossSiteClosePageACK(const ViewMsg_ClosePage_Params& params);
+  virtual bool WaitForUpdateMsg(int render_widget_id,
+                                const base::TimeDelta& max_delay,
+                                IPC::Message* msg);
+  virtual void ReceivedBadMessage();
+  virtual void WidgetRestored();
+  virtual void WidgetHidden();
+  virtual void ViewCreated();
+  virtual void SendVisitedLinkTable(base::SharedMemory* table_memory);
+  virtual void AddVisitedLinks(const VisitedLinkCommon::Fingerprints& links);
+  virtual void ResetVisitedLinks();
+  virtual bool FastShutdownIfPossible();
+  virtual bool SendWithTimeout(IPC::Message* msg, int timeout_ms);
+  virtual base::ProcessHandle GetHandle();
+  virtual TransportDIB* GetTransportDIB(TransportDIB::Id dib_id);
+
+  // IPC::Channel::Sender via RenderProcessHost.
+  virtual bool Send(IPC::Message* msg);
+
+  // IPC::Channel::Listener via RenderProcessHost.
+  virtual bool OnMessageReceived(const IPC::Message& msg);
+  virtual void OnChannelConnected(int32 peer_pid);
+  virtual void OnChannelError();
+
+  // NotificationObserver implementation.
+  virtual void Observe(NotificationType type,
+                       const NotificationSource& source,
+                       const NotificationDetails& details);
+
+  // ChildProcessLauncher::Client implementation.
+  virtual void OnProcessLaunched();
+
+ private:
+  friend class VisitRelayingRenderProcessHost;
+
+  // Creates and adds the IO thread message filters.
+  void CreateMessageFilters();
+
+  // Control message handlers.
+  void OnUpdatedCacheStats(const WebKit::WebCache::UsageStats& stats);
+  void SuddenTerminationChanged(bool enabled);
+  void OnExtensionAddListener(const std::string& extension_id,
+                              const std::string& event_name);
+  void OnExtensionRemoveListener(const std::string& extension_id,
+                                 const std::string& event_name);
+  void OnExtensionCloseChannel(int port_id);
+  void OnUserMetricsRecordAction(const std::string& action);
+
+  // Initialize support for visited links. Send the renderer process its initial
+  // set of visited links.
+  void InitVisitedLinks();
+
+  // Initialize support for user scripts. Send the renderer process its initial
+  // set of scripts and listen for updates to scripts.
+  void InitUserScripts();
+
+  // Initialize support for extension APIs. Send the list of registered API
+  // functions to thre renderer process.
+  void InitExtensions();
+
+  // Sends the renderer process a new set of user scripts.
+  void SendUserScriptsUpdate(base::SharedMemory* shared_memory);
+
+  // Generates a command line to be used to spawn a renderer and appends the
+  // results to |*command_line|.
+  void AppendRendererCommandLine(CommandLine* command_line) const;
+
+  // Copies applicable command line switches from the given |browser_cmd| line
+  // flags to the output |renderer_cmd| line flags. Not all switches will be
+  // copied over.
+  void PropagateBrowserCommandLineToRenderer(const CommandLine& browser_cmd,
+                                             CommandLine* renderer_cmd) const;
+
+  // Callers can reduce the RenderProcess' priority.
+  void SetBackgrounded(bool backgrounded);
+
+  // The renderer has requested that we initialize its spellchecker. This should
+  // generally only be called once per session, as after the first call, all
+  // future renderers will be passed the initialization information on startup
+  // (or when the dictionary changes in some way).
+  void OnSpellCheckerRequestDictionary();
+
+  // Tell the renderer of a new word that has been added to the custom
+  // dictionary.
+  void AddSpellCheckWord(const std::string& word);
+
+  // Pass the renderer some basic intialization information. Note that the
+  // renderer will not load Hunspell until it needs to.
+  void InitSpellChecker();
+
+  // Tell the renderer that auto spell correction has been enabled/disabled.
+  void EnableAutoSpellCorrect(bool enable);
+
+  // Initializes client-side phishing detection.  Starts reading the phishing
+  // model from the client-side detection service class.  Once the model is read
+  // OpenPhishingModelDone() is invoked.
+  void InitClientSidePhishingDetection();
+
+  // Called once the client-side detection service class is done with opening
+  // the model file.
+  void OpenPhishingModelDone(base::PlatformFile model_file);
+
+  NotificationRegistrar registrar_;
+
+  // The count of currently visible widgets.  Since the host can be a container
+  // for multiple widgets, it uses this count to determine when it should be
+  // backgrounded.
+  int32 visible_widgets_;
+
+  // Does this process have backgrounded priority.
+  bool backgrounded_;
+
+  // Used to allow a RenderWidgetHost to intercept various messages on the
+  // IO thread.
+  scoped_refptr<RenderWidgetHelper> widget_helper_;
+
+  // A map of transport DIB ids to cached TransportDIBs
+  std::map<TransportDIB::Id, TransportDIB*> cached_dibs_;
+  enum {
+    // This is the maximum size of |cached_dibs_|
+    MAX_MAPPED_TRANSPORT_DIBS = 3,
+  };
+
+  // Map a transport DIB from its Id and return it. Returns NULL on error.
+  TransportDIB* MapTransportDIB(TransportDIB::Id dib_id);
+
+  void ClearTransportDIBCache();
+  // This is used to clear our cache five seconds after the last use.
+  base::DelayTimer<BrowserRenderProcessHost> cached_dibs_cleaner_;
+
+  // Used in single-process mode.
+  scoped_ptr<RendererMainThread> in_process_renderer_;
+
+  // Buffer visited links and send them to to renderer.
+  scoped_ptr<VisitedLinkUpdater> visited_link_updater_;
+
+  // True if this prcoess should have accessibility enabled;
+  bool accessibility_enabled_;
+
+  // True iff this process is being used as an extension process. Not valid
+  // when running in single-process mode.
+  bool extension_process_;
+
+  // The Extension for the hosted or packaged app if any, NULL otherwise.
+  scoped_refptr<const Extension> installed_app_;
+
+  // Used to launch and terminate the process without blocking the UI thread.
+  scoped_ptr<ChildProcessLauncher> child_process_;
+
+  // Messages we queue while waiting for the process handle.  We queue them here
+  // instead of in the channel so that we ensure they're sent after init related
+  // messages that are sent once the process handle is available.  This is
+  // because the queued messages may have dependencies on the init messages.
+  std::queue<IPC::Message*> queued_messages_;
+
+  base::ScopedCallbackFactory<BrowserRenderProcessHost> callback_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(BrowserRenderProcessHost);
+};
+
+#endif  // CONTENT_BROWSER_RENDERER_HOST_BROWSER_RENDER_PROCESS_HOST_H_