Move part of display_compositor's interface to cc/ipc

services/ui/public/interfaces/gpu/display_compositor.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 ui.gpu.mojom;
 
 import "cc/ipc/compositor_frame.mojom";
 import "cc/ipc/returned_resource.mojom";
 
 // A CompositorFrameSinkFactory represents a single Display client.
 // The client (a process) can use this interface to create
 // CompositorFrameSinks.
 // TODO(fsamuel): This needs a better name.
 interface CompositorFrameSinkFactory {
   // Requests a CompositorFrameSink interface from the display compositor.
   // A CompositorFrameSink has an associated ID consisting of three components:
   // 1. Namespace picked by the service associated with this
   //    CompositorFrameSinkFactory.
   // 2. |local_id| which is a monotonically increasing ID allocated by the
   //    client.
   // 3. |nonce| is a cryptographically secure random number making this Sink
   //    unguessable by other clients.
   CreateCompositorFrameSink(uint32 local_id,
                             uint64 nonce,
                             CompositorFrameSink& sink,
                             CompositorFrameSinkClient client);
 };
 
-// A CompositorFrameSink 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 CompositorFrameSink {
-  // After the submitted frame is either drawn for the first time by the display
-  // compositor or discarded, the callback will be called. Clients should use
-  // this acknowledgement to ratelimit frame submissions.
-  // TODO(fsamuel): We should support identifying the CF in the callback.
-  SubmitCompositorFrame(cc.mojom.CompositorFrame frame) => ();
-
-  // Lets the display compositor know that the client wishes to receive the next
-  // BeginFrame event.
-  SetNeedsBeginFrame(bool needs_begin_frame);
-
-  // TODO(fsamuel): ReadbackBitmap API would be useful here.
-};
-
-interface CompositorFrameSinkClient {
-  ReturnResources(array<cc.mojom.ReturnedResource> resources);
-};
-
 // This is a public interface implemented by Display clients.
 // Each client implements a single instance of the DisplayClient interface.
 interface DisplayClient {
   // Clients can register CompositorFrameSinks via the provided |factory|.
   OnClientCreated(uint32 client_id, CompositorFrameSinkFactory factory);
 
   // TODO(fsamuel): OnBeginFrame needs to take a BeginFrameArgs instance per
   // cc/output/begin_frame_args.h.
   OnBeginFrame();
 };