cheets: implement cros side of WallpaperManagerService.

components/arc/BUILD.gn

 # Copyright 2015 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")
 import("//testing/test.gni")
 
 static_library("arc") {
   sources = [
     "arc_bridge_bootstrap.cc",
@@ skipping 138 matching lines @@
     "common/policy.mojom",
     "common/power.mojom",
     "common/print.mojom",
     "common/process.mojom",
     "common/scale_factor.mojom",
     "common/screen_rect.mojom",
     "common/storage_manager.mojom",
     "common/tts.mojom",
     "common/video.mojom",
     "common/video_accelerator.mojom",
+    "common/wallpaper.mojom",
   ]
 
   deps = [
     "//ui/gfx/geometry/mojo",
   ]
 
   use_new_wrapper_types = false
 }
 
 static_library("arc_test_support") {
@@ skipping 99 matching lines @@
   ]
 
   deps = [
     ":arc_standalone",
     ":arc_standalone_service",
     "//base",
     "//ipc:ipc",
     "//mojo/edk/system",
   ]
 }