include-what-you-use: Fix some tracing-related includes

content/common/gpu/client/gl_helper_unittest.cc

 // Copyright 2014 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 <stddef.h>
 #include <stdint.h>
 #include <stdio.h>
 #include <string.h>
 #include <cmath>
 #include <string>
 #include <vector>
 
 #include <GLES2/gl2.h>
 #include <GLES2/gl2ext.h>
 #include <GLES2/gl2extchromium.h>
 
 #include "base/at_exit.h"
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/files/file_util.h"
 #include "base/json/json_reader.h"
 #include "base/macros.h"
+#include "base/memory/ref_counted_memory.h"
 #include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
 #include "base/strings/stringprintf.h"
 #include "base/synchronization/waitable_event.h"
 #include "base/test/launcher/unit_test_launcher.h"
 #include "base/test/test_suite.h"
 #include "base/time/time.h"
 #include "base/trace_event/trace_event.h"
 #include "content/common/gpu/client/gl_helper.h"
 #include "content/common/gpu/client/gl_helper_readback_support.h"
@@ skipping 1953 matching lines @@
     }
   }
 }
 
 TEST_F(GLHelperTest, CheckOptimizations) {
   // Test in baseclass since it is friends with GLHelperScaling
   CheckOptimizationsTest();
 }
 
 }  // namespace content