Implement cc::CompositorFrameMetadata StructTraits

cc/ipc/BUILD.gn

 # Copyright 2016 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/config/ui.gni")
 import("//mojo/public/tools/bindings/mojom.gni")
 
 component("ipc") {
   output_name = "cc_ipc"
 
@@ skipping 20 matching lines @@
     "//ui/gfx",
     "//ui/gfx/ipc",
     "//ui/gfx/ipc/geometry",
     "//ui/gfx/ipc/skia",
   ]
 }
 
 mojom("interfaces") {
   sources = [
     "begin_frame_args.mojom",
+    "compositor_frame_metadata.mojom",
     "render_pass_id.mojom",
     "returned_resource.mojom",
     "selection.mojom",
     "shared_quad_state.mojom",
     "surface_id.mojom",
     "transferable_resource.mojom",
   ]
 
   public_deps = [
     "//gpu/ipc/common:interfaces",
     "//mojo/common:common_custom_types",
+    "//ui/events/mojo:interfaces",
     "//ui/gfx/geometry/mojo",
     "//ui/gfx/mojo",
   ]
 }
 
 mojom("test_interfaces") {
   testonly = true
   sources = [
     "traits_test_service.mojom",
   ]
 
   public_deps = [
     ":interfaces",
   ]
 }