Adding YUVA support for enabling Alpha Playback

cc/quads/yuv_video_draw_quad.h

Index: cc/quads/yuv_video_draw_quad.h
diff --git a/cc/quads/yuv_video_draw_quad.h b/cc/quads/yuv_video_draw_quad.h
index 9d54227369381dd196647d0891927e0d18e8d5c9..34a06124512ba75a2168592843b12ef82e9d0d0c 100644
--- a/cc/quads/yuv_video_draw_quad.h
+++ b/cc/quads/yuv_video_draw_quad.h
@@ -25,7 +25,8 @@ class CC_EXPORT YUVVideoDrawQuad : public DrawQuad {
               gfx::SizeF tex_scale,
               unsigned y_plane_resource_id,
               unsigned u_plane_resource_id,
-              unsigned v_plane_resource_id);
+              unsigned v_plane_resource_id,
+              unsigned a_plane_resource_id);
 
   void SetAll(const SharedQuadState* shared_quad_state,
               gfx::Rect rect,
@@ -35,12 +36,14 @@ class CC_EXPORT YUVVideoDrawQuad : public DrawQuad {
               gfx::SizeF tex_scale,
               unsigned y_plane_resource_id,
               unsigned u_plane_resource_id,
-              unsigned v_plane_resource_id);
+              unsigned v_plane_resource_id,
+              unsigned a_plane_resource_id);
 
   gfx::SizeF tex_scale;
   unsigned y_plane_resource_id;
   unsigned u_plane_resource_id;
   unsigned v_plane_resource_id;
+  unsigned a_plane_resource_id;
 
   virtual void IterateResources(const ResourceIteratorCallback& callback)
       OVERRIDE;