Introduce DisplayCompositor Mojo API for Mus

components/mus/public/interfaces/gpu/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("//mojo/public/tools/bindings/mojom.gni")
 
 mojom("interfaces") {
   sources = [
-    "view.mojom",
+    "display_compositor.mojom",
+    "display_compositor_host.mojom",
   ]
 
-  deps = [
+  public_deps = [
     "//components/mus/public/interfaces",
-    "//ui/gfx/geometry/mojo:interfaces",
-    "//url/mojo:url_mojom_gurl",
+    "//gpu/ipc/common:interfaces",
   ]
 }