Add preliminary support for hw-accelerated tile rasterization.

cc/resources/image_raster_worker_pool.h

 // Copyright 2013 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_RESOURCES_IMAGE_RASTER_WORKER_POOL_H_
 #define CC_RESOURCES_IMAGE_RASTER_WORKER_POOL_H_
 
 #include "cc/resources/raster_worker_pool.h"
 
 namespace cc {
 
 class CC_EXPORT ImageRasterWorkerPool : public RasterWorkerPool {
  public:
   virtual ~ImageRasterWorkerPool();
 
   static scoped_ptr<RasterWorkerPool> Create(
       ResourceProvider* resource_provider,
+      ContextProvider* context_provider,
       size_t num_threads,
       GLenum texture_target) {
     return make_scoped_ptr<RasterWorkerPool>(
         new ImageRasterWorkerPool(resource_provider,
+                                  context_provider,
                                   num_threads,
                                   texture_target));
   }
 
   // Overridden from RasterWorkerPool:
   virtual void ScheduleTasks(RasterTask::Queue* queue) OVERRIDE;
   virtual GLenum GetResourceTarget() const OVERRIDE;
   virtual ResourceFormat GetResourceFormat() const OVERRIDE;
   virtual void OnRasterTasksFinished() OVERRIDE;
   virtual void OnRasterTasksRequiredForActivationFinished() OVERRIDE;
 
  private:
   ImageRasterWorkerPool(ResourceProvider* resource_provider,
+                        ContextProvider* context_provider,
                         size_t num_threads,
                         GLenum texture_target);
 
   void OnRasterTaskCompleted(
       scoped_refptr<internal::RasterWorkerPoolTask> task, bool was_canceled);
 
   scoped_ptr<base::Value> StateAsValue() const;
 
   static void CreateGraphNodeForImageTask(
       internal::WorkerPoolTask* image_task,
@@ skipping 10 matching lines @@
 
   bool raster_tasks_pending_;
   bool raster_tasks_required_for_activation_pending_;
 
   DISALLOW_COPY_AND_ASSIGN(ImageRasterWorkerPool);
 };
 
 }  // namespace cc
 
 #endif  // CC_RESOURCES_IMAGE_RASTER_WORKER_POOL_H_