Allow shaped-desktop hosts to send shape only when it changes.

remoting/client/plugin/pepper_video_renderer.h

 // Copyright 2014 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_CLIENT_PLUGIN_PEPPER_VIDEO_RENDERER_H_
 #define REMOTING_CLIENT_PLUGIN_PEPPER_VIDEO_RENDERER_H_
 
 #include "remoting/client/video_renderer.h"
 
 namespace webrtc {
@@ skipping 22 matching lines @@
     // Called if video decoding fails, for any reason.
     virtual void OnVideoDecodeError() = 0;
 
     // Called when the first frame is received.
     virtual void OnVideoFirstFrameReceived() = 0;
 
     // Called when stream size changes.
     virtual void OnVideoSize(const webrtc::DesktopSize& size,
                              const webrtc::DesktopVector& dpi) = 0;
 
-    // Called when desktop shape changes.
-    virtual void OnVideoShape(const webrtc::DesktopRegion& shape) = 0;
+    // Called when desktop shape changes. |shape| should be NULL if frames are
+    // un-shaped.
+    virtual void OnVideoShape(const webrtc::DesktopRegion* shape) = 0;
 
     // Called with each frame's updated region, if EnableDebugDirtyRegion(true)
     // was called.
     virtual void OnVideoFrameDirtyRegion(
         const webrtc::DesktopRegion& dirty_region) = 0;
   };
 
   // Initializes the renderer. |instance| and |event_handler| must outlive the
   // renderer. Returns false if the renderer cannot be initialized.
   virtual bool Initialize(pp::Instance* instance,
                           const ClientContext& context,
                           EventHandler* event_handler) = 0;
 
   // Must be called whenever the plugin view changes.
   virtual void OnViewChanged(const pp::View& view) = 0;
 
   // Enables or disables delivery of dirty region information to the
   // EventHandler, for debugging purposes.
   virtual void EnableDebugDirtyRegion(bool enable) = 0;
 };
 
 }  // namespace remoting
 
 #endif  // REMOTING_CLIENT_PLUGIN_PEPPER_VIDEO_RENDERER_H_