Added the desktop shape fields to VideoPacket.

remoting/codec/video_decoder_vp8.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_CODEC_VIDEO_DECODER_VP8_H_
 #define REMOTING_CODEC_VIDEO_DECODER_VP8_H_
 
 #include "base/compiler_specific.h"
 #include "remoting/codec/video_decoder.h"
 
@@ skipping 12 matching lines @@
   virtual DecodeResult DecodePacket(const VideoPacket* packet) OVERRIDE;
   virtual bool IsReadyForData() OVERRIDE;
   virtual VideoPacketFormat::Encoding Encoding() OVERRIDE;
   virtual void Invalidate(const SkISize& view_size,
                           const SkRegion& region) OVERRIDE;
   virtual void RenderFrame(const SkISize& view_size,
                            const SkIRect& clip_area,
                            uint8* image_buffer,
                            int image_stride,
                            SkRegion* output_region) OVERRIDE;
+  virtual const SkRegion* GetImageShape() OVERRIDE;
 
  private:
   enum State {
     kUninitialized,
     kReady,
     kError,
   };
 
+  // Fills the rectangle |rect| with the given ARGB color |color| in |buffer|.
+  void FillRect(uint8* buffer, int stride, const SkIRect& rect, uint32 color);
+
+  // Calculates the difference between the desktop shape regions in two
+  // consecutive frames and updates |updated_region_| and |transparent_region_|
+  // accordingly.
+  void UpdateDesktopShapeRegion(SkRegion* new_desktop_shape_region);
+
   // The internal state of the decoder.
   State state_;
 
   vpx_codec_ctx_t* codec_;
 
   // Pointer to the last decoded image.
   vpx_image_t* last_image_;
 
   // The region updated that hasn't been copied to the screen yet.
   SkRegion updated_region_;
 
   // Output dimensions.
   SkISize screen_size_;
 
+  // The region occupied by the top level windows.
+  SkRegion desktop_shape_region_;
+
+  // The region that should be make transparent.
+  SkRegion transparent_region_;
+
   DISALLOW_COPY_AND_ASSIGN(VideoDecoderVp8);
 };
 
 }  // namespace remoting
 
 #endif  // REMOTING_CODEC_VIDEO_DECODER_VP8_H_