Mus: Introduce DisplayCompositorClient mojo interface

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 23 matching lines @@
     "//ui/gfx/ipc/geometry",
     "//ui/gfx/ipc/skia",
   ]
 }
 
 mojom("interfaces") {
   sources = [
     "begin_frame_args.mojom",
     "compositor_frame.mojom",
     "compositor_frame_metadata.mojom",
+    "display_compositor.mojom",
     "filter_operation.mojom",
     "filter_operations.mojom",
     "frame_sink_id.mojom",
     "local_frame_id.mojom",
     "mojo_compositor_frame_sink.mojom",
     "quads.mojom",
     "render_pass.mojom",
     "render_pass_id.mojom",
     "returned_resource.mojom",
     "selection.mojom",
@@ skipping 55 matching lines @@
     "//mojo/common:struct_traits",
     "//skia/public/interfaces:struct_traits",
     "//ui/events:events_base",
     "//ui/events/mojo:struct_traits",
     "//ui/gfx",
     "//ui/gfx:selection_bound",
     "//ui/gfx/geometry/mojo:struct_traits",
     "//ui/gfx/mojo:struct_traits",
   ]
 }