cheets: implement cros side of WallpaperManagerService.

components/arc/wallpaper/arc_wallpaper_bridge.h

+// 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.
+
+#ifndef COMPONENTS_ARC_WALLPAPER_ARC_WALLPAPER_BRIDGE_H_
+#define COMPONENTS_ARC_WALLPAPER_ARC_WALLPAPER_BRIDGE_H_
+
+#include <stdint.h>
+
+#include "base/macros.h"
+#include "components/arc/arc_bridge_service.h"

[xiyuan, 2016/08/19 23:04:07]

We can move this into cc file and forward declare ArcBridgeService.

[Muyuan, 2016/08/22 22:25:00]

Done.

+#include "components/arc/arc_service.h"
+#include "components/arc/common/wallpaper.mojom.h"
+#include "components/arc/instance_holder.h"
+#include "components/arc/set_wallpaper_delegate.h"

[xiyuan, 2016/08/19 23:04:07]

Move to cc file and forward declare SetWallpaperDelegate.

[Muyuan, 2016/08/22 22:25:00]

Done.

+#include "mojo/public/cpp/bindings/binding.h"
+
+namespace arc {
+
+class ArcWallpaperBridge
+    : public ArcService,
+      public InstanceHolder<mojom::WallpaperInstance>::Observer,
+      public mojom::WallpaperHost {
+ public:
+  explicit ArcWallpaperBridge(ArcBridgeService* bridge_service,

[xiyuan, 2016/08/19 23:04:07]

"explicit" is only needed for single arg ctor, so not needed here.

[Muyuan, 2016/08/22 22:25:00]

Done.

+                              const std::shared_ptr<SetWallpaperDelegate>&
+                              delegate);
+  ~ArcWallpaperBridge() override;
+
+  // InstanceHolder<mojom::WallpaperInstance>::Observer overrides.
+  void OnInstanceReady() override;
+
+  // mojo::WallpaperHost overrides.
+  void SetWallpaper(mojo::Array<uint8_t> jpeg_data) override;
+  void GetWallpaper(const base::Callback<void(mojo::Array<uint8_t>)>& callback)
+      override;
+
+ private:
+  std::shared_ptr<SetWallpaperDelegate> wallpaper_delegate_;
+  mojo::Binding<mojom::WallpaperHost> binding_;
+  base::ThreadChecker thread_checker_;
+
+  DISALLOW_COPY_AND_ASSIGN(ArcWallpaperBridge);
+};
+
+}  // namespace arc
+
+#endif  // COMPONENTS_ARC_WALLPAPER_ARC_WALLPAPER_BRIDGE_H_