text: 
  /*
   * Copyright 2015 Google Inc.
   *
   * Use of this source code is governed by a BSD-style license that can be
   * found in the LICENSE file.
   */
  #ifndef SkGpuFenceSync_DEFINED
  #define SkGpuFenceSync_DEFINED
  
  #include "SkTypes.h"
  
  typedef void* SkPlatformGpuFence;
  
  /*
   * This class provides an interface to interact with fence syncs. A fence sync is an object that the
   * client can insert into the GPU command stream, and then at any future time, wait until all
   * commands that were issued before the fence have completed.
   */
  class SkGpuFenceSync {
  public:
      virtual SkPlatformGpuFence SK_WARN_UNUSED_RESULT insertFence() const = 0;
      virtual bool flushAndWaitFence(SkPlatformGpuFence) const = 0;
      virtual void deleteFence(SkPlatformGpuFence) const = 0;
  
      virtual ~SkGpuFenceSync() {}
  };
  
  #endif
  