cc: Add new RasterWorkerPool interface.

cc/base/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_BASE_WORKER_POOL_H_
 #define CC_BASE_WORKER_POOL_H_
 
 #include <deque>
 #include <string>
 #include <vector>
@@ skipping 61 matching lines @@
   // Tells the worker pool to shutdown and returns once all pending tasks have
   // completed.
   virtual void Shutdown();
 
   // Set a new client.
   void SetClient(WorkerPoolClient* client) {
     client_ = client;
   }
 
   // Force a check for completed tasks.
-  void CheckForCompletedTasks();
+  virtual void CheckForCompletedTasks();
 
  protected:
   WorkerPool(size_t num_threads,
              base::TimeDelta check_for_completed_tasks_delay,
              const std::string& thread_name_prefix);
 
   void ScheduleTasks(internal::WorkerPoolTask* root);
 
  private:
   class Inner;
@@ skipping 11 matching lines @@
   base::TimeDelta check_for_completed_tasks_delay_;
   bool check_for_completed_tasks_pending_;
 
   // Hide the gory details of the worker pool in |inner_|.
   const scoped_ptr<Inner> inner_;
 };
 
 }  // namespace cc
 
 #endif  // CC_BASE_WORKER_POOL_H_