Add video frame recording capability to Chromoting hosts.

remoting/host/client_session.h

Index: remoting/host/client_session.h
diff --git a/remoting/host/client_session.h b/remoting/host/client_session.h
index a86839ec5875e133f5a6f87a987829cd112aeb40..44ec4932d4df6da05d6ce84fe2fb5b3f135c89d9 100644
--- a/remoting/host/client_session.h
+++ b/remoting/host/client_session.h
@@ -44,6 +44,7 @@ class DesktopEnvironmentFactory;
 class InputInjector;
 class ScreenControls;
 class VideoEncoder;
+class VideoFrameRecorder;
 class VideoScheduler;
 
 // A ClientSession keeps a reference to a connection to a client, and maintains
@@ -165,6 +166,11 @@ class ClientSession
     return client_capabilities_.get();
   }
 
+  // Manages an optional VideoFrameRecorder, used to record session content
+  // The recorder must be set before the ClientSession becomes authenticated.
+  void set_video_frame_recorder(scoped_ptr<VideoFrameRecorder> recorder);
+  VideoFrameRecorder* video_frame_recorder() const;
+
  private:
   typedef ScopedVector<HostExtensionSession> HostExtensionSessionList;
 
@@ -263,6 +269,9 @@ class ClientSession
   // Used to proxy gnubby auth traffic.
   scoped_ptr<GnubbyAuthHandler> gnubby_auth_handler_;
 
+  // Used to record sequences of video frames.
+  scoped_ptr<VideoFrameRecorder> video_frame_recorder_;
+
   // Host extension sessions, used to handle extension messages.
   HostExtensionSessionList extension_sessions_;