Adding YUVA support for enabling Alpha Playback

content/common/cc_messages.h

Index: content/common/cc_messages.h
diff --git a/content/common/cc_messages.h b/content/common/cc_messages.h
index c489b9760a2f6fdc9d8cce28c4ec7f8cc238a48c..98f3d61cc45f4a1364d8dbe483fc2896dbd77ad7 100644
--- a/content/common/cc_messages.h
+++ b/content/common/cc_messages.h
@@ -20,6 +20,7 @@
 #include "cc/transferable_resource.h"
 #include "cc/video_layer_impl.h"
 #include "cc/yuv_video_draw_quad.h"
+#include "cc/yuva_video_draw_quad.h"
 #include "content/common/content_export.h"
 #include "ipc/ipc_message_macros.h"
 #include "third_party/WebKit/Source/Platform/chromium/public/WebFilterOperation.h"
@@ -205,6 +206,15 @@ IPC_STRUCT_TRAITS_BEGIN(cc::YUVVideoDrawQuad)
   IPC_STRUCT_TRAITS_MEMBER(v_plane)
 IPC_STRUCT_TRAITS_END()
 
+IPC_STRUCT_TRAITS_BEGIN(cc::YUVAVideoDrawQuad)
+  IPC_STRUCT_TRAITS_PARENT(cc::DrawQuad)
+  IPC_STRUCT_TRAITS_MEMBER(tex_scale)
+  IPC_STRUCT_TRAITS_MEMBER(y_plane)
+  IPC_STRUCT_TRAITS_MEMBER(u_plane)
+  IPC_STRUCT_TRAITS_MEMBER(v_plane)
+  IPC_STRUCT_TRAITS_MEMBER(a_plane)
+IPC_STRUCT_TRAITS_END()
+
 IPC_STRUCT_TRAITS_BEGIN(cc::SharedQuadState)
   IPC_STRUCT_TRAITS_MEMBER(content_to_target_transform)
   IPC_STRUCT_TRAITS_MEMBER(visible_content_rect)