Reuse GLFenceNV when an existing CommandsCompletedQuery is reused

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 <stdint.h>
 
 #include <queue>
 
 #include "base/atomic_ref_count.h"
 #include "base/atomicops.h"
 #include "base/callback.h"
 #include "base/macros.h"
 #include "base/memory/linked_ptr.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/shared_memory.h"
 #include "base/memory/weak_ptr.h"
 #include "gpu/command_buffer/service/cmd_buffer_engine.h"
 #include "gpu/command_buffer/service/cmd_parser.h"
 #include "gpu/command_buffer/service/command_buffer_service.h"
 #include "gpu/command_buffer/service/gles2_cmd_decoder.h"
 #include "gpu/gpu_export.h"
 
-namespace gfx {
-class GLFence;
-}
-
 namespace gpu {
 
 class PreemptionFlag
     : public base::RefCountedThreadSafe<PreemptionFlag> {
  public:
   PreemptionFlag() : flag_(0) {}
 
   bool IsSet() { return !base::AtomicRefCountIsZero(&flag_); }
   void Set() { base::AtomicRefCountInc(&flag_); }
   void Reset() { base::subtle::NoBarrier_Store(&flag_, 0); }
@@ skipping 98 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_