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

remoting/host/client_session.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_CLIENT_SESSION_H_
 #define REMOTING_HOST_CLIENT_SESSION_H_
 
 #include <list>
 
 #include "base/memory/ref_counted.h"
@@ skipping 20 matching lines @@
 }  // namespace base
 
 namespace remoting {
 
 class AudioEncoder;
 class AudioScheduler;
 struct ClientSessionTraits;
 class DesktopEnvironment;
 class DesktopEnvironmentFactory;
 class EventExecutor;
+class SessionController;
 class VideoEncoder;
 class VideoScheduler;
 
 // A ClientSession keeps a reference to a connection to a client, and maintains
 // per-client state.
 class ClientSession
     : public base::RefCountedThreadSafe<ClientSession, ClientSessionTraits>,
       public protocol::HostStub,
       public protocol::ConnectionToClient::EventHandler,
       public base::NonThreadSafe {
@@ skipping 20 matching lines @@
     virtual void OnSessionSequenceNumber(ClientSession* client,
                                          int64 sequence_number) = 0;
 
     // Called on notification of a route change event, when a channel is
     // connected.
     virtual void OnSessionRouteChange(
         ClientSession* client,
         const std::string& channel_name,
         const protocol::TransportRoute& route) = 0;
 
-    // Called when the initial client resolution is received, and when it
-    // changes.
-    virtual void OnClientResolutionChanged(ClientSession* client,
-                                           const SkISize& size,
-                                           const SkIPoint& dpi) = 0;
-
    protected:
     virtual ~EventHandler() {}
   };
 
   // |event_handler| must outlive |this|. |desktop_environment_factory| is only
   // used by the constructor to create an instance of DesktopEnvironment.
   ClientSession(
       EventHandler* event_handler,
       scoped_refptr<base::SingleThreadTaskRunner> audio_task_runner,
       scoped_refptr<base::SingleThreadTaskRunner> input_task_runner,
@@ skipping 126 matching lines @@
   scoped_refptr<base::SingleThreadTaskRunner> video_encode_task_runner_;
   scoped_refptr<base::SingleThreadTaskRunner> network_task_runner_;
   scoped_refptr<base::SingleThreadTaskRunner> ui_task_runner_;
 
   // Schedulers for audio and video capture.
   scoped_refptr<AudioScheduler> audio_scheduler_;
   scoped_refptr<VideoScheduler> video_scheduler_;
 
   scoped_ptr<EventExecutor> event_executor_;
 
+  scoped_ptr<SessionController> session_controller_;
+
   DISALLOW_COPY_AND_ASSIGN(ClientSession);
 };
 
 // Destroys |ClienSession| instances on the network thread.
 struct ClientSessionTraits {
   static void Destruct(const ClientSession* client);
 };
 
 }  // namespace remoting
 
 #endif  // REMOTING_HOST_CLIENT_SESSION_H_