cheets: implement cros side of WallpaperManagerService.

components/arc/wallpaper/arc_wallpaper_bridge.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/wallpaper/arc_wallpaper_bridge.h"
+
+#include <vector>
+
+#include "base/bind.h"
+#include "base/logging.h"
+#include "components/arc/arc_bridge_service.h"
+#include "components/arc/set_wallpaper_delegate.h"
+
+namespace arc {
+
+namespace {
+
+void HandleWallpaperResult(
+    const base::Callback<void(mojo::Array<uint8_t>)>& callback,
+    std::vector<uint8_t> image) {
+  callback.Run(std::move(image));
+}
+}

[xiyuan, 2016/08/22 22:49:41]

nit: insert an empty line before and add "// namespace"

[Muyuan, 2016/08/22 23:48:19]

Done.

[Shuhei Takahashi, 2016/08/23 09:34:22]

Could you upload a new patch please?

[Muyuan, 2016/08/23 19:45:49]

Done.

+
+ArcWallpaperBridge::ArcWallpaperBridge(
+    ArcBridgeService* bridge_service,
+    const std::shared_ptr<SetWallpaperDelegate>& delegate)
+    : ArcService(bridge_service),
+      wallpaper_delegate_(delegate),
+      binding_(this) {
+  arc_bridge_service()->wallpaper()->AddObserver(this);
+}
+
+ArcWallpaperBridge::~ArcWallpaperBridge() {
+  DCHECK(thread_checker_.CalledOnValidThread());
+  arc_bridge_service()->wallpaper()->RemoveObserver(this);
+}
+
+void ArcWallpaperBridge::OnInstanceReady() {
+  mojom::WallpaperInstance* wallpaper_instance =

[Shuhei Takahashi, 2016/08/23 09:34:22]

Please call DCHECK(thread_checker_.CalledOnValidThread()); here too.

[Muyuan, 2016/08/23 19:45:49]

Done.

+      arc_bridge_service()->wallpaper()->instance();
+  if (!wallpaper_instance) {
+    LOG(ERROR) << "OnWallpaperInstanceReady called, "
+               << "but no wallpaper instance found";
+    return;
+  }
+  wallpaper_instance->Init(binding_.CreateInterfacePtrAndBind());
+}
+
+void ArcWallpaperBridge::SetWallpaper(mojo::Array<uint8_t> jpeg_data) {
+  DCHECK(thread_checker_.CalledOnValidThread());
+  wallpaper_delegate_->SetWallpaper(jpeg_data.PassStorage());
+}
+
+void ArcWallpaperBridge::GetWallpaper(
+    const base::Callback<void(mojo::Array<uint8_t>)>& callback) {
+  DCHECK(thread_checker_.CalledOnValidThread());
+  wallpaper_delegate_->GetWallpaper(
+      base::Bind(&HandleWallpaperResult, callback));
+}
+
+}  // namespace arc