Implement cc::CompositorFrameMetadata StructTraits

components/mus/public/interfaces/compositor_frame.mojom

 // Copyright 2015 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.
 
 module mus.mojom;
 
+import "cc/ipc/compositor_frame_metadata.mojom";
 import "cc/ipc/returned_resource.mojom";
 import "cc/ipc/transferable_resource.mojom";
 import "components/mus/public/interfaces/quads.mojom";
 import "ui/gfx/geometry/mojo/geometry.mojom";
 import "gpu/ipc/common/mailbox_holder.mojom";
 import "gpu/ipc/common/sync_token.mojom";
 
-// See cc/output/compositor_frame_metadata.h.
-struct CompositorFrameMetadata {
-  float device_scale_factor;
-};
-
 // See src/cc/output/compositor_frame.h.
 struct CompositorFrame {
-  CompositorFrameMetadata metadata;
+  cc.mojom.CompositorFrameMetadata metadata;
   array<cc.mojom.TransferableResource> resources;
   array<Pass> passes;
 };
 
 // A Surface is an interface for receiving CompositorFrame structs. This is a
 // separate interface to allow CompositorFrames to be delivered from
 // supplementary (not main) threads of a mojo app.
 interface Surface {
   // After the submitted frame is drawn for the first time, the receiver will
   // respond to the SubmitFrame message. Clients should use this acknowledgement
   // to ratelimit frame submissions.
   SubmitCompositorFrame(CompositorFrame frame) => ();
 };
 
 interface SurfaceClient {
   ReturnResources(array<cc.mojom.ReturnedResource> resources);
 };