Make RenderWidget responsible for the composited view's lifetime

webkit/compositor_bindings/web_layer_tree_view_impl.h

 // Copyright 2011 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 WebLayerTreeViewImpl_h
 #define WebLayerTreeViewImpl_h
 
 #include "base/memory/scoped_ptr.h"
 #include "cc/layer_tree_host_client.h"
 #include "third_party/WebKit/Source/Platform/chromium/public/WebLayerTreeView.h"
@@ skipping 12 matching lines @@
 
 class WebLayerTreeViewImpl : public WebLayerTreeView, public cc::LayerTreeHostClient {
 public:
     WEBKIT_COMPOSITOR_BINDINGS_EXPORT explicit WebLayerTreeViewImpl(
         WebLayerTreeViewClient*);
     virtual ~WebLayerTreeViewImpl();
 
     WEBKIT_COMPOSITOR_BINDINGS_EXPORT bool initialize(
         const Settings&, scoped_ptr<cc::Thread> implThread);
 
+    WEBKIT_COMPOSITOR_BINDINGS_EXPORT cc::LayerTreeHost* layer_tree_host() const;
+
     // WebLayerTreeView implementation.
     virtual void setSurfaceReady() OVERRIDE;
     virtual void setRootLayer(const WebLayer&) OVERRIDE;
     virtual void clearRootLayer() OVERRIDE;
     virtual void setViewportSize(const WebSize& layoutViewportSize, const WebSize& deviceViewportSize = WebSize()) OVERRIDE;
     virtual WebSize layoutViewportSize() const OVERRIDE;
     virtual WebSize deviceViewportSize() const OVERRIDE;
     virtual WebFloatPoint adjustEventPointForPinchZoom(const WebFloatPoint& point) const OVERRIDE;
     virtual void setDeviceScaleFactor(float) OVERRIDE;
     virtual float deviceScaleFactor() const OVERRIDE;
@@ skipping 33 matching lines @@
     virtual scoped_ptr<cc::FontAtlas> createFontAtlas();
 
 private:
     WebLayerTreeViewClient* m_client;
     scoped_ptr<cc::LayerTreeHost> m_layerTreeHost;
 };
 
 } // namespace WebKit
 
 #endif // WebLayerTreeViewImpl_h