ui: Add ref-counting to GLFence class.

gpu/command_buffer/service/fence_manager.h

Index: gpu/command_buffer/service/fence_manager.h
diff --git a/gpu/command_buffer/service/fence_manager.h b/gpu/command_buffer/service/fence_manager.h
index 13c711b942bae63d58d47270ea720e9ab09e5f5c..1fe522954c487d8c1f686158c041e5c74659c65c 100644
--- a/gpu/command_buffer/service/fence_manager.h
+++ b/gpu/command_buffer/service/fence_manager.h
@@ -26,12 +26,12 @@ class GPU_EXPORT 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);