Sky should use an SkPicture when drawing

sky/viewer/document_view.h

Index: sky/viewer/document_view.h
diff --git a/sky/viewer/document_view.h b/sky/viewer/document_view.h
index 1c80db9f69504a159099257ed9a1bd05ef209fef..a5151b52ace1bcd531f282c2acdd9ef8b8a618b0 100644
--- a/sky/viewer/document_view.h
+++ b/sky/viewer/document_view.h
@@ -35,6 +35,8 @@ class InspectorBackendMojo;
 
 namespace sky {
 class InspectorHostImpl;
+class Rasterizer;
+class RasterizerBitmap;
 class ScriptRunner;
 class Layer;
 class LayerHost;
@@ -118,6 +120,7 @@ class DocumentView : public blink::ServiceProvider,
 
   void Load(mojo::URLResponsePtr response);
   float GetDevicePixelRatio() const;
+  scoped_ptr<Rasterizer> CreateRasterizer();
 
   mojo::URLResponsePtr response_;
   mojo::ServiceProviderImpl exported_services_;
@@ -130,12 +133,14 @@ class DocumentView : public blink::ServiceProvider,
   InspectorServiceFactory inspector_service_factory_;
   scoped_ptr<LayerHost> layer_host_;
   scoped_refptr<Layer> root_layer_;
+  RasterizerBitmap* bitmap_rasterizer_;  // Used for pixel tests.
   scoped_ptr<ScriptRunner> script_runner_;
   scoped_ptr<InspectorHostImpl> inspector_host_;
   scoped_ptr<inspector::InspectorBackendMojo> inspector_backend_;
-  base::WeakPtrFactory<DocumentView> weak_factory_;
   int debugger_id_;
 
+  base::WeakPtrFactory<DocumentView> weak_factory_;
+
   DISALLOW_COPY_AND_ASSIGN(DocumentView);
 };