gpu: Implement idle async pixel transfers.

gpu/command_buffer/service/gpu_scheduler.h

 // Copyright (c) 2012 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 GPU_COMMAND_BUFFER_SERVICE_GPU_SCHEDULER_H_
 #define GPU_COMMAND_BUFFER_SERVICE_GPU_SCHEDULER_H_
 
 #include <queue>
 
 #include "base/atomicops.h"
@@ skipping 79 matching lines @@
   virtual int32 GetGetOffset() OVERRIDE;
 
   void SetCommandProcessedCallback(const base::Closure& callback);
 
   void DeferToFence(base::Closure task);
 
   // Polls the fences, invoking callbacks that were waiting to be triggered
   // by them and returns whether all fences were complete.
   bool PollUnscheduleFences();
 
+  bool HasMoreIdleWork();
+  void PerformIdleWork();
+
   CommandParser* parser() const {
     return parser_.get();
   }
 
   bool IsPreempted();
 
  private:
   // Artificially reschedule if the scheduler is still unscheduled after a
   // timeout.
   void RescheduleTimeOut();
@@ skipping 45 matching lines @@
   // If non-NULL and |preemption_flag_->IsSet()|, exit PutChanged early.
   scoped_refptr<PreemptionFlag> preemption_flag_;
   bool was_preempted_;
 
   DISALLOW_COPY_AND_ASSIGN(GpuScheduler);
 };
 
 }  // namespace gpu
 
 #endif  // GPU_COMMAND_BUFFER_SERVICE_GPU_SCHEDULER_H_