Add VideoPacket struct for video packets. Refactor Decode interface to use it.

remoting/host/capturer.h

Index: remoting/host/capturer.h
diff --git a/remoting/host/capturer.h b/remoting/host/capturer.h
index 8a11ed505c880d66864b7013784dc89cfef6ec63..f9e967afe310a4cf2ab010fdf39a9df673ef65c0 100644
--- a/remoting/host/capturer.h
+++ b/remoting/host/capturer.h
@@ -49,13 +49,13 @@ class Capturer {
   virtual void ScreenConfigurationChanged() = 0;
 
   // Return the width of the screen.
-  virtual int width() const { return width_; }
+  virtual int width() const;
 
   // Return the height of the screen.
-  virtual int height() const { return height_; }
+  virtual int height() const;
 
   // Return the pixel format of the screen.
-  virtual PixelFormat pixel_format() const { return pixel_format_; }
+  virtual media::VideoFrame::Format pixel_format() const;
 
   // Clear out the list of invalid rects.
   void ClearInvalidRects();
@@ -116,7 +116,7 @@ class Capturer {
   int height_;
 
   // Format of pixels returned in buffer.
-  PixelFormat pixel_format_;
+  media::VideoFrame::Format pixel_format_;
   int bytes_per_row_;
 
   // The current buffer with valid data for reading.