Adding YUVA support for enabling Alpha Playback

cc/output/gl_renderer.h

Index: cc/output/gl_renderer.h
diff --git a/cc/output/gl_renderer.h b/cc/output/gl_renderer.h
index 549f7aeccefac4cc4ed4a3fa42fced19994e7021..a1f515bfebe991ddce8b5942c3974b6fb2a77a2a 100644
--- a/cc/output/gl_renderer.h
+++ b/cc/output/gl_renderer.h
@@ -250,6 +250,8 @@ class CC_EXPORT GLRenderer :
       VideoStreamTextureProgram;
   typedef ProgramBinding<VertexShaderPosTexYUVStretch, FragmentShaderYUVVideo>
       VideoYUVProgram;
+  typedef ProgramBinding<VertexShaderPosTexYUVStretch, FragmentShaderYUVAVideo>
+      VideoYUVAProgram;
 
   // Special purpose / effects shaders.
   typedef ProgramBinding<VertexShaderPos, FragmentShaderColor>
@@ -277,6 +279,7 @@ class CC_EXPORT GLRenderer :
   const TextureIOSurfaceProgram* GetTextureIOSurfaceProgram();
 
   const VideoYUVProgram* GetVideoYUVProgram();
+  const VideoYUVAProgram* GetVideoYUVAProgram();
   const VideoStreamTextureProgram* GetVideoStreamTextureProgram();
 
   const DebugBorderProgram* GetDebugBorderProgram();
@@ -301,6 +304,7 @@ class CC_EXPORT GLRenderer :
   scoped_ptr<TextureIOSurfaceProgram> texture_io_surface_program_;
 
   scoped_ptr<VideoYUVProgram> video_yuv_program_;
+  scoped_ptr<VideoYUVAProgram> video_yuva_program_;
   scoped_ptr<VideoStreamTextureProgram> video_stream_texture_program_;
 
   scoped_ptr<DebugBorderProgram> debug_border_program_;