cheets: implement cros side of WallpaperManagerService.

components/arc/common/arc_bridge.mojom

 // 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.
 
 module arc.mojom;
 
 import "app.mojom";
 import "audio.mojom";
 import "auth.mojom";
 import "bluetooth.mojom";
 import "clipboard.mojom";
 import "crash_collector.mojom";
 import "enterprise_reporting.mojom";
 import "file_system.mojom";
 import "ime.mojom";
 import "intent_helper.mojom";
 import "metrics.mojom";
 import "net.mojom";
 import "notifications.mojom";
 import "obb_mounter.mojom";
 import "policy.mojom";
 import "power.mojom";
 import "print.mojom";
 import "process.mojom";
 import "storage_manager.mojom";
 import "tts.mojom";
 import "video.mojom";
+import "wallpaper.mojom";
 
-// Next MinVersion: 18
+// Next MinVersion: 19
 // Deprecated method IDs: 101, 105
-// Next method ID: 124
+// Next method ID: 125
 interface ArcBridgeHost {
   // Keep the entries alphabetical. In order to do so without breaking
   // compatibility with the ARC instance, explicitly assign each interface a
   // unique ordinal.
 
   // Notifies Chrome that the AppInstance interface is ready.
   OnAppInstanceReady@100(AppInstance instance_ptr);
 
   // Notifies Chrome that the AudioInstance interface is ready.
   [MinVersion=8] OnAudioInstanceReady@115(AudioInstance instance_ptr);
@@ skipping 51 matching lines @@
   OnProcessInstanceReady@104(ProcessInstance instance_ptr);
 
   // Notifies Chrome that the StorageManagerInstance interface is ready.
   [MinVersion=12] OnStorageManagerInstanceReady@118(StorageManagerInstance instance_ptr);
 
   // Notifies Chrome that the TtsInstance interface is ready.
   [MinVersion=17] OnTtsInstanceReady@123(TtsInstance instance_ptr);
 
   // Notifies Chrome that the VideoInstance interface is ready.
   [MinVersion=6] OnVideoInstanceReady@107(VideoInstance instance_ptr);
+
+  // Notifies Chrome that the WallpaperInstance interface is ready.
+  [MinVersion=18] OnWallpaperInstanceReady@124(WallpaperInstance instance_ptr);
 };
 
 interface ArcBridgeInstance {
   // Establishes full-duplex communication with the host.
   // |host_ptr| is the MessagePipe endpoint that is bound to the
   // ArcBridgeHostPtr binding.
   Init@0(ArcBridgeHost host_ptr);
 };