ui: Add ref-counting to GLFence class.

gpu/command_buffer/service/fence_manager.h

 // Copyright 2016 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_FENCE_MANAGER_H_
 #define GPU_COMMAND_BUFFER_SERVICE_FENCE_MANAGER_H_
 
 #include <stdint.h>
 
 #include "base/containers/hash_tables.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "gpu/gpu_export.h"
 
 namespace gl {
 class GLFence;
 }
 
 namespace gpu {
 namespace gles2 {
 
 // This class keeps track of the fences and their state.
 class GPU_EXPORT FenceManager {
  public:
   FenceManager();
   ~FenceManager();
 
   void Destroy(bool have_context);
-  void AddFence(std::unique_ptr<gl::GLFence> fence, int32_t service_id);
+  void AddFence(gl::GLFence* fence, int32_t service_id);
   void RemoveFence(int32_t service_id);
   gl::GLFence* LookupFence(int32_t service_id);
 
  private:
-  typedef base::hash_map<int32_t, std::unique_ptr<gl::GLFence>> GLFenceMap;
+  typedef base::hash_map<int32_t, scoped_refptr<gl::GLFence>> GLFenceMap;
   GLFenceMap fences_;
 
   DISALLOW_COPY_AND_ASSIGN(FenceManager);
 };
 
 }  // namespage gles2
 }  // namespace gpu
 
 #endif  // GPU_COMMAND_BUFFER_SERVICE_FENCE_MANAGER_H_