ResizingHostObserver is created by the desktop environment together with other stubs.

remoting/host/desktop_session_proxy.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 REMOTING_HOST_DESKTOP_SESSION_PROXY_H_
 #define REMOTING_HOST_DESKTOP_SESSION_PROXY_H_
 
 #include <map>
 
 #include "base/basictypes.h"
@@ skipping 25 matching lines @@
 
 namespace remoting {
 
 class AudioPacket;
 class ClientSession;
 class DesktopSessionConnector;
 struct DesktopSessionParams;
 struct DesktopSessionProxyTraits;
 class IpcAudioCapturer;
 class IpcVideoFrameCapturer;
+class SessionController;
 
 // DesktopSessionProxy is created by an owning DesktopEnvironment to route
 // requests from stubs to the DesktopSessionAgent instance through
 // the IPC channel. DesktopSessionProxy is owned both by the DesktopEnvironment
 // and the stubs, since stubs can out-live their DesktopEnvironment.
 //
 // DesktopSessionProxy objects are ref-counted but are always deleted on
 // the |caller_tast_runner_| thread. This makes it possible to continue
 // to receive IPC messages after the ref-count has dropped to zero, until
 // the proxy is deleted. DesktopSessionProxy must therefore avoid creating new
@@ skipping 12 matching lines @@
       scoped_refptr<base::SingleThreadTaskRunner> io_task_runner,
       const std::string& client_jid,
       const base::Closure& disconnect_callback);
 
   // Mirrors DesktopEnvironment.
   scoped_ptr<AudioCapturer> CreateAudioCapturer(
       scoped_refptr<base::SingleThreadTaskRunner> audio_task_runner);
   scoped_ptr<EventExecutor> CreateEventExecutor(
       scoped_refptr<base::SingleThreadTaskRunner> input_task_runner,
       scoped_refptr<base::SingleThreadTaskRunner> ui_task_runner);
+  scoped_ptr<SessionController> CreateSessionController();
   scoped_ptr<media::ScreenCapturer> CreateVideoCapturer(
       scoped_refptr<base::SingleThreadTaskRunner> capture_task_runner,
       scoped_refptr<base::SingleThreadTaskRunner> encode_task_runner);
 
   // IPC::Listener implementation.
   virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
   virtual void OnChannelConnected(int32 peer_pid) OVERRIDE;
   virtual void OnChannelError() OVERRIDE;
 
   // Connects to the desktop session agent.
@@ skipping 118 matching lines @@
 };
 
 // Destroys |DesktopSessionProxy| instances on the caller's thread.
 struct DesktopSessionProxyTraits {
   static void Destruct(const DesktopSessionProxy* desktop_session_proxy);
 };
 
 }  // namespace remoting
 
 #endif  // REMOTING_HOST_DESKTOP_SESSION_PROXY_H_