ui: Add ref-counting to GLFence class.

gpu/command_buffer/service/gles2_cmd_decoder.cc

Index: gpu/command_buffer/service/gles2_cmd_decoder.cc
diff --git a/gpu/command_buffer/service/gles2_cmd_decoder.cc b/gpu/command_buffer/service/gles2_cmd_decoder.cc
index 2f6003ccdbac7d05aa08093bd3141eb13726a618..40f5c63f5eacf92a34f0ad249c536f857c99e617 100644
--- a/gpu/command_buffer/service/gles2_cmd_decoder.cc
+++ b/gpu/command_buffer/service/gles2_cmd_decoder.cc
@@ -458,7 +458,7 @@ struct FenceCallback {
   FenceCallback(FenceCallback&&) = default;
   FenceCallback& operator=(FenceCallback&&) = default;
   std::vector<base::Closure> callbacks;
-  std::unique_ptr<gl::GLFence> fence;
+  scoped_refptr<gl::GLFence> fence;
 };
 
 // }  // anonymous namespace.
@@ -2360,7 +2360,7 @@ class GLES2DecoderImpl : public GLES2Decoder, public ErrorStateClient {
   // After a second fence is inserted, both the GpuChannelMessageQueue and
   // CommandExecutor are descheduled. Once the first fence has completed, both
   // get rescheduled.
-  std::vector<std::unique_ptr<gl::GLFence>> deschedule_until_finished_fences_;
+  std::vector<scoped_refptr<gl::GLFence>> deschedule_until_finished_fences_;
 
   // Used to validate multisample renderbuffers if needed
   typedef base::hash_map<GLenum, GLuint> TextureMap;
@@ -15353,7 +15353,7 @@ error::Error GLES2DecoderImpl::HandleDescheduleUntilFinishedCHROMIUM(
     return error::kNoError;
   }
 
-  std::unique_ptr<gl::GLFence> fence(gl::GLFence::Create());
+  scoped_refptr<gl::GLFence> fence(gl::GLFence::Create());
   deschedule_until_finished_fences_.push_back(std::move(fence));
 
   if (deschedule_until_finished_fences_.size() == 1)