Revert of cc: Implement shared worker contexts.

cc/trees/layer_tree_host_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 CC_TREES_LAYER_TREE_HOST_IMPL_H_
 #define CC_TREES_LAYER_TREE_HOST_IMPL_H_
 
 #include <set>
 #include <string>
 #include <vector>
@@ skipping 344 matching lines @@
   void SetMemoryPolicy(const ManagedMemoryPolicy& policy) override;
   void SetTreeActivationCallback(const base::Closure& callback) override;
   void OnDraw() override;
 
   // Called from LayerTreeImpl.
   void OnCanDrawStateChangedForTree();
 
   // Implementation.
   int id() const { return id_; }
   bool CanDraw() const;
-  OutputSurface* output_surface() const { return output_surface_; }
+  OutputSurface* output_surface() const { return output_surface_.get(); }
 
   std::string LayerTreeAsJson() const;
 
   void FinishAllRendering();
   int RequestedMSAASampleCount() const;
 
-  virtual bool InitializeRenderer(OutputSurface* output_surface);
+  virtual bool InitializeRenderer(scoped_ptr<OutputSurface> output_surface);
   TileManager* tile_manager() { return tile_manager_.get(); }
 
   void SetHasGpuRasterizationTrigger(bool flag) {
     has_gpu_rasterization_trigger_ = flag;
     UpdateGpuRasterizationStatus();
   }
   void SetContentIsSuitableForGpuRasterization(bool flag) {
     content_is_suitable_for_gpu_rasterization_ = flag;
     UpdateGpuRasterizationStatus();
   }
@@ skipping 306 matching lines @@
 
   typedef base::hash_map<UIResourceId, UIResourceData>
       UIResourceMap;
   UIResourceMap ui_resource_map_;
 
   // Resources that were evicted by EvictAllUIResources. Resources are removed
   // from this when they are touched by a create or destroy from the UI resource
   // request queue.
   std::set<UIResourceId> evicted_ui_resources_;
 
-  OutputSurface* output_surface_;
+  scoped_ptr<OutputSurface> output_surface_;
 
   scoped_ptr<ResourceProvider> resource_provider_;
   bool content_is_suitable_for_gpu_rasterization_;
   bool has_gpu_rasterization_trigger_;
   bool use_gpu_rasterization_;
   bool use_msaa_;
   GpuRasterizationStatus gpu_rasterization_status_;
   bool tree_resources_for_gpu_rasterization_dirty_;
   scoped_ptr<TileTaskWorkerPool> tile_task_worker_pool_;
   scoped_ptr<ResourcePool> resource_pool_;
@@ skipping 106 matching lines @@
   scoped_ptr<FrameTimingTracker> frame_timing_tracker_;
 
   scoped_ptr<Viewport> viewport_;
 
   DISALLOW_COPY_AND_ASSIGN(LayerTreeHostImpl);
 };
 
 }  // namespace cc
 
 #endif  // CC_TREES_LAYER_TREE_HOST_IMPL_H_