Introduce RenderProcessHostObserver, use it in its first client.

content/browser/renderer_host/render_process_host_impl.h

 // 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.
 
 #ifndef CONTENT_BROWSER_RENDERER_HOST_BROWSER_RENDER_PROCESS_HOST_IMPL_H_
 #define CONTENT_BROWSER_RENDERER_HOST_BROWSER_RENDER_PROCESS_HOST_IMPL_H_
 
 #include <map>
 #include <queue>
 #include <string>
 
 #include "base/memory/scoped_ptr.h"
+#include "base/observer_list.h"
 #include "base/process/process.h"
 #include "base/timer/timer.h"
 #include "content/browser/child_process_launcher.h"
 #include "content/browser/power_monitor_message_broadcaster.h"
 #include "content/common/content_export.h"
 #include "content/public/browser/global_request_id.h"
 #include "content/public/browser/gpu_data_manager_observer.h"
 #include "content/public/browser/render_process_host.h"
 #include "ipc/ipc_channel_proxy.h"
 #include "ui/surface/transport_dib.h"
@@ skipping 52 matching lines @@
                         bool supports_browser_plugin,
                         bool is_guest);
   virtual ~RenderProcessHostImpl();
 
   // RenderProcessHost implementation (public portion).
   virtual void EnableSendQueue() OVERRIDE;
   virtual bool Init() OVERRIDE;
   virtual int GetNextRoutingID() OVERRIDE;
   virtual void AddRoute(int32 routing_id, IPC::Listener* listener) OVERRIDE;
   virtual void RemoveRoute(int32 routing_id) OVERRIDE;
+  virtual void AddObserver(RenderProcessHostObserver* observer) OVERRIDE;
+  virtual void RemoveObserver(RenderProcessHostObserver* observer) OVERRIDE;
+  virtual bool HasObserver(RenderProcessHostObserver* observer) OVERRIDE;
   virtual bool WaitForBackingStoreMsg(int render_widget_id,
                                       const base::TimeDelta& max_delay,
                                       IPC::Message* msg) OVERRIDE;
   virtual void ReceivedBadMessage() OVERRIDE;
   virtual void WidgetRestored() OVERRIDE;
   virtual void WidgetHidden() OVERRIDE;
   virtual int VisibleWidgetCount() const OVERRIDE;
   virtual bool IsGuest() const OVERRIDE;
   virtual StoragePartition* GetStoragePartition() const OVERRIDE;
   virtual bool FastShutdownIfPossible() OVERRIDE;
@@ skipping 205 matching lines @@
   std::queue<IPC::Message*> queued_messages_;
 
   // The globally-unique identifier for this RPH.
   int id_;
 
   BrowserContext* browser_context_;
 
   // Owned by |browser_context_|.
   StoragePartitionImpl* storage_partition_impl_;
 
+  // The observers watching our lifetime.
+  ObserverList<RenderProcessHostObserver> observers_;
+
   // True if the process can be shut down suddenly.  If this is true, then we're
   // sure that all the RenderViews in the process can be shutdown suddenly.  If
   // it's false, then specific RenderViews might still be allowed to be shutdown
   // suddenly by checking their SuddenTerminationAllowed() flag.  This can occur
   // if one WebContents has an unload event listener but another WebContents in
   // the same process doesn't.
   bool sudden_termination_allowed_;
 
   // Set to true if we shouldn't send input events.  We actually do the
   // filtering for this at the render widget level.
@@ skipping 26 matching lines @@
 #if defined(OS_ANDROID)
   scoped_refptr<BrowserDemuxerAndroid> browser_demuxer_android_;
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(RenderProcessHostImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_BROWSER_RENDER_PROCESS_HOST_IMPL_H_