Introduce RenderProcessHostObserver, use it in its first client.

content/public/test/mock_render_process_host.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_PUBLIC_TEST_MOCK_RENDER_PROCESS_HOST_H_
 #define CONTENT_PUBLIC_TEST_MOCK_RENDER_PROCESS_HOST_H_
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_vector.h"
 #include "content/public/browser/render_process_host.h"
@@ skipping 20 matching lines @@
 
   // Provides test access to how many times a bad message has been received.
   int bad_msg_count() const { return bad_msg_count_; }
 
   // 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 void AddWord(const string16& word);
@@ skipping 73 matching lines @@
   // for deleting all MockRenderProcessHosts that have not deleted by a test in
   // the destructor and prevent them from being leaked.
   mutable ScopedVector<MockRenderProcessHost> processes_;
 
   DISALLOW_COPY_AND_ASSIGN(MockRenderProcessHostFactory);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_TEST_MOCK_RENDER_PROCESS_HOST_H_