Implemented StructTraits for cc::TextureMailbox

cc/resources/texture_mailbox.h

Index: cc/resources/texture_mailbox.h
diff --git a/cc/resources/texture_mailbox.h b/cc/resources/texture_mailbox.h
index a8d1f79e2c0264a29e1c3d7a29f2c5800464793e..bcb40c575a56b308c3ab0e74ef5ab41b497816b5 100644
--- a/cc/resources/texture_mailbox.h
+++ b/cc/resources/texture_mailbox.h
@@ -13,10 +13,16 @@
 #include "base/memory/shared_memory.h"
 #include "cc/base/cc_export.h"
 #include "gpu/command_buffer/common/mailbox_holder.h"
+#include "mojo/public/cpp/bindings/struct_traits.h"
 #include "ui/gfx/color_space.h"
 #include "ui/gfx/geometry/size.h"
 
 namespace cc {
+
+namespace mojom {
+class TextureMailboxDataView;
+}
+
 class SharedBitmap;
 
 // TODO(skaslev, danakj) Rename this class more apropriately since now it
@@ -93,6 +99,9 @@ class CC_EXPORT TextureMailbox {
 #endif
 
  private:
+  friend struct mojo::StructTraits<mojom::TextureMailboxDataView,
+                                   TextureMailbox>;
+
   gpu::MailboxHolder mailbox_holder_;
   SharedBitmap* shared_bitmap_;
   gfx::Size size_in_pixels_;