GTTF: Run perf tests serially

media/base/run_all_perftests.cc

Index: media/base/run_all_perftests.cc
diff --git a/media/base/run_all_unittests.cc b/media/base/run_all_perftests.cc
similarity index 86%
copy from media/base/run_all_unittests.cc
copy to media/base/run_all_perftests.cc
index f1a0092814c999f3866cc241cb576e7f53125995..119bef330388dc137e0ddcb3f9e7a7b76d05ed34 100644
--- a/media/base/run_all_unittests.cc
+++ b/media/base/run_all_perftests.cc
@@ -1,4 +1,4 @@
-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// 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.
 
@@ -46,7 +46,10 @@ void TestSuiteNoAtExit::Initialize() {
 int main(int argc, char** argv) {
   TestSuiteNoAtExit test_suite(argc, argv);
 
-  return base::LaunchUnitTests(
+  // Always run the perf tests serially, to avoid distorting
+  // perf measurements with randomness resulting from running
+  // in parallel.
+  return base::LaunchUnitTestsSerially(
       argc, argv, base::Bind(&TestSuiteNoAtExit::Run,
                              base::Unretained(&test_suite)));
 }