Refactor SkyShell to allow multiple SkyViews

sky/shell/ui/engine.h

 // Copyright 2015 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 SKY_SHELL_UI_ENGINE_H_
 #define SKY_SHELL_UI_ENGINE_H_
 
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
@@ skipping 32 matching lines @@
 
     base::WeakPtr<GPUDelegate> gpu_delegate;
     scoped_refptr<base::SingleThreadTaskRunner> gpu_task_runner;
   };
 
   explicit Engine(const Config& config);
   ~Engine() override;
 
   base::WeakPtr<Engine> GetWeakPtr();
 
-  void Init();
+  static void Init(ServiceProviderContext* service_provider_context);
 
   void BeginFrame(base::TimeTicks frame_time);
   skia::RefPtr<SkPicture> Paint();
 
  private:
   // UIDelegate methods:
   void ConnectToViewportObserver(
       mojo::InterfaceRequest<ViewportObserver> request) override;
   void OnAcceleratedWidgetAvailable(gfx::AcceleratedWidget widget) override;
   void OnOutputSurfaceDestroyed() override;
@@ skipping 25 matching lines @@
   // NavigatorHost methods:
   void RequestNavigate(mojo::Target target,
                        mojo::URLRequestPtr request) override;
   void DidNavigateLocally(const mojo::String& url) override;
   void RequestNavigateHistory(int32_t delta) override;
 
   void UpdateSkyViewSize();
   void UpdateWebViewSize();
 
   Config config_;
-  mojo::ServiceProviderPtr service_provider_;
-  scoped_ptr<PlatformImpl> platform_impl_;
   scoped_ptr<Animator> animator_;
 
   std::unique_ptr<blink::SkyView> sky_view_;
   blink::WebView* web_view_;
 
   float device_pixel_ratio_;
   gfx::Size physical_size_;
   mojo::Binding<ViewportObserver> viewport_observer_binding_;
 
   base::WeakPtrFactory<Engine> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(Engine);
 };
 
 }  // namespace shell
 }  // namespace sky
 
 #endif  // SKY_SHELL_UI_ENGINE_H_