Added Destroy() functions for GPUTimer and GPUTracer/GPUTrace.

gpu/command_buffer/service/gpu_tracer.h

Index: gpu/command_buffer/service/gpu_tracer.h
diff --git a/gpu/command_buffer/service/gpu_tracer.h b/gpu/command_buffer/service/gpu_tracer.h
index 1b2c31578a4110c7975bd279fe414c3dddc76b4a..3f8ec84812f496717f94c563f64ffeb6ef3dc4eb 100644
--- a/gpu/command_buffer/service/gpu_tracer.h
+++ b/gpu/command_buffer/service/gpu_tracer.h
@@ -56,6 +56,8 @@ class GPU_EXPORT GPUTracer
   explicit GPUTracer(gles2::GLES2Decoder* decoder);
   virtual ~GPUTracer();
 
+  void Destroy(bool have_context);
+
   // Scheduled processing in decoder begins.
   bool BeginDecoding();
 
@@ -83,13 +85,14 @@ class GPU_EXPORT GPUTracer
 
   void Process();
   void ProcessTraces();
+  void ClearFinishedTraces(bool have_context);
 
   void IssueProcessTask();
 
   scoped_refptr<gfx::GPUTimingClient> gpu_timing_client_;
   scoped_refptr<Outputter> outputter_;
   std::vector<TraceMarker> markers_[NUM_TRACER_SOURCES];
-  std::deque<scoped_refptr<GPUTrace> > traces_;
+  std::deque<scoped_refptr<GPUTrace> > finished_traces_;
 
   const unsigned char* gpu_trace_srv_category;
   const unsigned char* gpu_trace_dev_category;
@@ -155,6 +158,8 @@ class GPU_EXPORT GPUTrace
            const std::string& name,
            const bool enabled);
 
+  void Destroy(bool have_context);
+
   void Start(bool trace_service);
   void End(bool tracing_service);
   bool IsAvailable();