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

gpu/perftests/measurements.cc

 // Copyright 2015 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.
 
 #include "gpu/perftests/measurements.h"
 
 #include "base/logging.h"
 #include "testing/perf/perf_test.h"
 #include "ui/gl/gpu_timing.h"
 
@@ skipping 78 matching lines @@
   }
   int64 gpu_time = -1;
   if (gpu_timer_.get() != nullptr && gpu_timer_->IsAvailable()) {
     gpu_time = gpu_timer_->GetDeltaElapsed();
   }
   return Measurement(name, wall_time_, cpu_time_,
                      base::TimeDelta::FromMicroseconds(gpu_time));
 }
 
 MeasurementTimers::~MeasurementTimers() {
+  if (gpu_timer_.get()) {
+    gpu_timer_->Destroy(true);
+  }
 }
 
 }  // namespace gpu