cc: Remove cc:RasterRequiredForActivation synthetic delays.

cc/resources/rasterizer.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 CC_RESOURCES_RASTERIZER_H_
 #define CC_RESOURCES_RASTERIZER_H_
 
 #include <vector>
 
 #include "base/callback.h"
@@ skipping 109 matching lines @@
     bool required_for_activation;
   };
 
   RasterTaskQueue();
   ~RasterTaskQueue();
 
   void Swap(RasterTaskQueue* other);
   void Reset();
 
   Item::Vector items;
-  size_t required_for_activation_count;
 };
 
 // This interface can be used to schedule and run raster tasks. The client will
 // be notified asynchronously when the set of tasks marked as "required for
 // activation" have finished running and when all scheduled tasks have finished
 // running. The client can call CheckForCompletedTasks() at any time to dispatch
 // pending completion callbacks for all tasks that have finished running.
 class CC_EXPORT Rasterizer {
  public:
   // Set the client instance to be notified when finished running tasks.
@@ skipping 14 matching lines @@
   // Check for completed tasks and dispatch reply callbacks.
   virtual void CheckForCompletedTasks() = 0;
 
  protected:
   virtual ~Rasterizer() {}
 };
 
 }  // namespace cc
 
 #endif  // CC_RESOURCES_RASTERIZER_H_