cc: Introduce embedded_surfaces in metadata for surface Ids in draw quads

cc/ipc/compositor_frame_metadata_struct_traits.h

Index: cc/ipc/compositor_frame_metadata_struct_traits.h
diff --git a/cc/ipc/compositor_frame_metadata_struct_traits.h b/cc/ipc/compositor_frame_metadata_struct_traits.h
index 46bb130d42b799e7350f17787c714980d6e9cb36..f3077ce9495a4378c3dffeaec3ff398f9606b90e 100644
--- a/cc/ipc/compositor_frame_metadata_struct_traits.h
+++ b/cc/ipc/compositor_frame_metadata_struct_traits.h
@@ -106,6 +106,11 @@ struct StructTraits<cc::mojom::CompositorFrameMetadataDataView,
     return metadata.referenced_surfaces;
   }
 
+  static const std::vector<cc::SurfaceId>& embedded_surfaces(
+      const cc::CompositorFrameMetadata& metadata) {
+    return metadata.embedded_surfaces;
+  }
+
   static bool can_activate_before_dependencies(
       const cc::CompositorFrameMetadata& metadata) {
     return metadata.can_activate_before_dependencies;