cc: Add gfx::BufferFormat to cc::ResourceProvider::Resource.

cc/ipc/transferable_resource_struct_traits.h

Index: cc/ipc/transferable_resource_struct_traits.h
diff --git a/cc/ipc/transferable_resource_struct_traits.h b/cc/ipc/transferable_resource_struct_traits.h
index a85f054e5846588dd1a691c0971baaa9d7421bcb..1e3f24b75678f80eff3a178195dc3c6b2eba00d1 100644
--- a/cc/ipc/transferable_resource_struct_traits.h
+++ b/cc/ipc/transferable_resource_struct_traits.h
@@ -22,6 +22,11 @@ struct StructTraits<cc::mojom::TransferableResourceDataView,
     return static_cast<cc::mojom::ResourceFormat>(resource.format);
   }
 
+  static gfx::mojom::BufferFormat buffer_format(
+      const cc::TransferableResource& resource) {
+    return static_cast<gfx::mojom::BufferFormat>(resource.buffer_format);
+  }
+
   static uint32_t filter(const cc::TransferableResource& resource) {
     return resource.filter;
   }