arc: IPC method to set custom wallpaper.

components/arc/intent_helper/arc_intent_helper_bridge.h

Index: components/arc/intent_helper/arc_intent_helper_bridge.h
diff --git a/components/arc/intent_helper/arc_intent_helper_bridge.h b/components/arc/intent_helper/arc_intent_helper_bridge.h
index cf3714e85675f7ba231aee497044e5274f696c87..566e410947fa25986f8fbf9c9bf72f05b9edf0a4 100644
--- a/components/arc/intent_helper/arc_intent_helper_bridge.h
+++ b/components/arc/intent_helper/arc_intent_helper_bridge.h
@@ -10,6 +10,8 @@
 #include "ash/link_handler_model_factory.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
+#include "base/memory/weak_ptr.h"
+#include "base/task_runner.h"
 #include "components/arc/arc_bridge_service.h"
 #include "components/arc/arc_service.h"
 #include "components/arc/common/intent_helper.mojom.h"
@@ -21,9 +23,16 @@ class LinkHandlerModel;
 
 }  // namespace ash
 
+namespace gfx {
+
+class ImageSkia;
+
+}  // namespace gfx
+
 namespace arc {
 
 class ActivityIconLoader;
+class SetWallpaperDelegate;
 
 // Receives intents from ARC.
 class ArcIntentHelperBridge : public ArcService,
@@ -31,8 +40,11 @@ class ArcIntentHelperBridge : public ArcService,
                               public mojom::IntentHelperHost,
                               public ash::LinkHandlerModelFactory {
  public:
-  ArcIntentHelperBridge(ArcBridgeService* bridge_service,
-                        const scoped_refptr<ActivityIconLoader>& icon_loader);
+  ArcIntentHelperBridge(
+      ArcBridgeService* bridge_service,
+      const scoped_refptr<ActivityIconLoader>& icon_loader,
+      const scoped_refptr<base::TaskRunner>& blocking_task_runner,
+      std::unique_ptr<SetWallpaperDelegate> set_wallpaper_delegate);
   ~ArcIntentHelperBridge() override;
 
   // ArcBridgeService::Observer
@@ -44,13 +56,22 @@ class ArcIntentHelperBridge : public ArcService,
   void OnOpenDownloads() override;
   void OnOpenUrl(const mojo::String& url) override;
   void OpenWallpaperPicker() override;
+  void SetWallpaper(mojo::Array<uint8_t> jpeg_data) override;
 
   // ash::LinkHandlerModelFactory
   std::unique_ptr<ash::LinkHandlerModel> CreateModel(const GURL& url) override;
 
  private:
+  void SetImageAsWallpaper(gfx::ImageSkia image);
+
   mojo::Binding<mojom::IntentHelperHost> binding_;
   scoped_refptr<ActivityIconLoader> icon_loader_;
+  scoped_refptr<base::TaskRunner> blocking_task_runner_;
+  std::unique_ptr<SetWallpaperDelegate> set_wallpaper_delegate_;
+
+  // Note: This should remain the last member so it'll be destroyed and
+  // invalidate its weak pointers before any other members are destroyed.
+  base::WeakPtrFactory<ArcIntentHelperBridge> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ArcIntentHelperBridge);
 };