Plumb ViewportMetrics change notifications around the world and back.

sky/viewer/document_view.h

 // Copyright 2014 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_VIEWER_DOCUMENT_VIEW_H_
 #define SKY_VIEWER_DOCUMENT_VIEW_H_
 
 #include "base/callback.h"
 #include "base/memory/weak_ptr.h"
 #include "mojo/public/cpp/application/lazy_interface_ptr.h"
@@ skipping 94 matching lines @@
   // ViewManagerDelegate methods:
   void OnEmbed(mojo::View* root,
                mojo::InterfaceRequest<mojo::ServiceProvider> services,
                mojo::ServiceProviderPtr exposed_services) override;
   void OnViewManagerDisconnected(mojo::ViewManager* view_manager) override;
 
   // ViewObserver methods:
   void OnViewBoundsChanged(mojo::View* view,
                            const mojo::Rect& old_bounds,
                            const mojo::Rect& new_bounds) override;
+  void OnViewViewportMetricsChanged(
+      mojo::View* view,
+      const mojo::ViewportMetrics& old_metrics,
+      const mojo::ViewportMetrics& new_metrics) override;
   void OnViewFocusChanged(mojo::View* gained_focus,
                           mojo::View* lost_focus) override;
   void OnViewDestroyed(mojo::View* view) override;
   void OnViewInputEvent(mojo::View* view, const mojo::EventPtr& event) override;
 
   void Load(mojo::URLResponsePtr response);
   float GetDevicePixelRatio() const;
   scoped_ptr<Rasterizer> CreateRasterizer();
 
+  void UpdateRootSizeAndViewportMetrics(const mojo::Rect& new_bounds);
+
   mojo::URLResponsePtr response_;
   mojo::ServiceProviderImpl exported_services_;
   mojo::ServiceProviderPtr imported_services_;
   mojo::Shell* shell_;
   mojo::LazyInterfacePtr<mojo::NavigatorHost> navigator_host_;
   blink::WebView* web_view_;
   mojo::View* root_;
   mojo::ViewManagerClientFactory view_manager_client_factory_;
   InspectorServiceFactory inspector_service_factory_;
   mojo::ServiceProviderImpl inspector_service_provider_impl_;
   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_;
   int debugger_id_;
 
   base::WeakPtrFactory<DocumentView> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(DocumentView);
 };
 
 }  // namespace sky
 
 #endif  // SKY_VIEWER_DOCUMENT_VIEW_H_