Implement temporary reference assignment with DisplayCompositor.

cc/ipc/mojo_compositor_frame_sink.mojom

 // 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.
 
 module cc.mojom;
 
 import "cc/ipc/begin_frame_args.mojom";
 import "cc/ipc/compositor_frame.mojom";
 import "cc/ipc/copy_output_request.mojom";
 import "cc/ipc/frame_sink_id.mojom";
 import "cc/ipc/local_surface_id.mojom";
-import "cc/ipc/surface_reference.mojom";
+import "cc/ipc/surface_id.mojom";
 import "cc/ipc/returned_resource.mojom";
 import "cc/ipc/surface_sequence.mojom";
 import "ui/gfx/geometry/mojo/geometry.mojom";
 
 // A MojoCompositorFrameSink is an interface for receiving CompositorFrame
 // structs. A CompositorFrame contains the complete output meant for display.
 // Each time a client has a graphical update, and receives an OnBeginFrame, it
 // is responsible for creating a CompositorFrame to update its portion of the
 // screen.
 interface MojoCompositorFrameSink {
@@ skipping 34 matching lines @@
   ReclaimResources(ReturnedResourceArray resources);
 
   // Called when surface is being scheduled for a draw.
   WillDrawSurface(LocalSurfaceId local_surface_id, gfx.mojom.Rect damage_rect);
 };
 
 // MojoCompositorFrameSinkPrivate is used by the display compositor host to
 // perform privilieged operations on a CompositorFrameSink such as
 // CopyOutputRequests.
 interface MojoCompositorFrameSinkPrivate {
+  // Claims this FrameSinkId will embed |surface_id| so it should own the
+  // temporary reference to |surface_id|.
+  ClaimTemporaryReference(SurfaceId surface_id);
+
   // Requests that the renderer send back a copy of the surface that this
   // CompositorFrameSink submits to. The result can be in form of a bitmap
   // or a texture. See cc::CopyOutputRequest.
   RequestCopyOfSurface(cc.mojom.CopyOutputRequest request);
 };