Implement VP9/I444 encode support in the Chromoting host.

remoting/codec/video_encoder_vpx.h

Index: remoting/codec/video_encoder_vpx.h
diff --git a/remoting/codec/video_encoder_vpx.h b/remoting/codec/video_encoder_vpx.h
index dd7fb2ee516c4eff1445972ed4e83b2f039a57b7..8a8d68be642b8999c66cf3c6fbf8a0febb609cb9 100644
--- a/remoting/codec/video_encoder_vpx.h
+++ b/remoting/codec/video_encoder_vpx.h
@@ -23,7 +23,8 @@ class VideoEncoderVpx : public VideoEncoder {
  public:
   // Create encoder for the specified protocol.
   static scoped_ptr<VideoEncoderVpx> CreateForVP8();
-  static scoped_ptr<VideoEncoderVpx> CreateForVP9();
+  static scoped_ptr<VideoEncoderVpx> CreateForVP9I420();
+  static scoped_ptr<VideoEncoderVpx> CreateForVP9I444();
 
   virtual ~VideoEncoderVpx();
 
@@ -33,9 +34,14 @@ class VideoEncoderVpx : public VideoEncoder {
 
  private:
   typedef base::Callback<ScopedVpxCodec(const webrtc::DesktopSize&)>
-      InitializeCodecCallback;
+      CreateCodecCallback;
+  typedef base::Callback<void(const webrtc::DesktopSize&,
+                              scoped_ptr<vpx_image_t>* out_image,
+                              scoped_ptr<uint8[]>* out_image_buffer)>
+      CreateImageCallback;
 
-  VideoEncoderVpx(const InitializeCodecCallback& init_codec);
+  VideoEncoderVpx(const CreateCodecCallback& create_codec,
+                  const CreateImageCallback& create_image);
 
   // Initializes the codec for frames of |size|. Returns true if successful.
   bool Initialize(const webrtc::DesktopSize& size);
@@ -49,17 +55,20 @@ class VideoEncoderVpx : public VideoEncoder {
   // given to the encoder to speed up encoding.
   void PrepareActiveMap(const webrtc::DesktopRegion& updated_region);
 
-  InitializeCodecCallback init_codec_;
+  CreateCodecCallback create_codec_;
+  CreateImageCallback create_image_;
 
   ScopedVpxCodec codec_;
+  base::TimeTicks timestamp_base_;
+
+  // VPX image and buffer to hold the actual YUV planes.
   scoped_ptr<vpx_image_t> image_;
+  scoped_ptr<uint8[]> image_buffer_;
+
+  // Active map used to optimize out processing of un-changed macroblocks.
   scoped_ptr<uint8[]> active_map_;
   int active_map_width_;
   int active_map_height_;
-  base::TimeTicks timestamp_base_;
-
-  // Buffer for storing the yuv image.
-  scoped_ptr<uint8[]> yuv_image_;
 
   DISALLOW_COPY_AND_ASSIGN(VideoEncoderVpx);
 };