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,
+    const std::vector<uint8_t>& image) {
+  callback.Run(std::move(image));
+}
+
+}  // namespace
+
+ArcWallpaperBridge::ArcWallpaperBridge(ArcBridgeService* bridge_service,
+                                       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() {
+  DCHECK(thread_checker_.CalledOnValidThread());
+  mojom::WallpaperInstance* wallpaper_instance =
+      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));

[dcheng, 2016/08/29 20:33:19]

FWIW, mojo::Array and stuff are deprecated. If we get rid of
use_new_wrapper_types = false from the GN file, then we wouldn't have to create
an intermediate callback here. We should probably consider doing this sooner
rather than later.

[Muyuan, 2016/08/30 01:02:33]

Added a TODO in the source. I'll fix that in the future when the whole module is
upgraded to new interface.

+}
+
+}  // namespace arc