cheets: implement cros side of WallpaperManagerService.

components/arc/arc_bridge_host_impl.cc

 // 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.
 
 #include "components/arc/arc_bridge_host_impl.h"
 
 #include <algorithm>
 #include <utility>
 
 #include "base/bind.h"
@@ skipping 170 matching lines @@
 
 void ArcBridgeHostImpl::OnTtsInstanceReady(mojom::TtsInstancePtr tts_ptr) {
   OnInstanceReady(ArcBridgeService::Get()->tts(), std::move(tts_ptr));
 }
 
 void ArcBridgeHostImpl::OnVideoInstanceReady(
     mojom::VideoInstancePtr video_ptr) {
   OnInstanceReady(ArcBridgeService::Get()->video(), std::move(video_ptr));
 }
 
+void ArcBridgeHostImpl::OnWallpaperInstanceReady(
+    mojom::WallpaperInstancePtr wallpaper_ptr) {
+  OnInstanceReady(ArcBridgeService::Get()->wallpaper(),
+                  std::move(wallpaper_ptr));
+}
+
 void ArcBridgeHostImpl::OnClosed() {
   DCHECK(thread_checker_.CalledOnValidThread());
   VLOG(1) << "Mojo connection lost";
 
   // Close all mojo channels.
   mojo_channels_.clear();
   instance_.reset();
   if (binding_.is_bound())
     binding_.Close();
 }
@@ skipping 25 matching lines @@
 void ArcBridgeHostImpl::OnChannelClosed(MojoChannel* channel) {
   DCHECK(thread_checker_.CalledOnValidThread());
   mojo_channels_.erase(
       std::find_if(mojo_channels_.begin(), mojo_channels_.end(),
                    [channel](std::unique_ptr<MojoChannel>& ptr) {
                      return ptr.get() == channel;
                    }));
 }
 
 }  // namespace arc