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 39 matching lines @@
     "render_pass.mojom",
     "render_pass_id.mojom",
     "returned_resource.mojom",
     "selection.mojom",
     "shared_quad_state.mojom",
     "surface_id.mojom",
     "surface_sequence.mojom",
     "transferable_resource.mojom",
   ]
 
-  deps = [
+  public_deps = [
     "//gpu/ipc/common:interfaces",
     "//mojo/common:common_custom_types",
     "//skia/public/interfaces",
     "//ui/events/mojo:interfaces",
     "//ui/gfx/geometry/mojo",
     "//ui/gfx/mojo",
   ]
 }
 
+# Interfaces between two privileged services.
+mojom("internal_interfaces") {
+  sources = [
+    "display_compositor.mojom",
+  ]
+
+  public_deps = [
+    ":interfaces",
+    "//ui/gfx/geometry/mojo",
+  ]
+}
+
 mojom("test_interfaces") {
   testonly = true
   sources = [
     "traits_test_service.mojom",
   ]
 
   public_deps = [
     ":interfaces",
   ]
 }
@@ skipping 29 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",
   ]
 }