Added the desktop shape fields to VideoPacket.

remoting/codec/video_decoder.h

Index: remoting/codec/video_decoder.h
diff --git a/remoting/codec/video_decoder.h b/remoting/codec/video_decoder.h
index f1eb650d10c7341ff2d5e4e5ac62a25201448e6f..4e1d39f44967736045612482d8ff30e5abf148ae 100644
--- a/remoting/codec/video_decoder.h
+++ b/remoting/codec/video_decoder.h
@@ -68,6 +68,10 @@ class VideoDecoder {
                            uint8* image_buffer,
                            int image_stride,
                            SkRegion* output_region) = 0;
+
+  // Returns the "shape", if any, of the most recently rendered frame.
+  // The shape is returned in source dimensions.
+  virtual const SkRegion* GetImageShape() = 0;
 };
 
 }  // namespace remoting