fix for high resolution timer on windows.

base/message_loop/message_loop_unittest.cc

 // Copyright 2013 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 <vector>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/compiler_specific.h"
 #include "base/logging.h"
@@ skipping 708 matching lines @@
 TEST(MessageLoopTest, IOHandler) {
   RunTest_IOHandler();
 }
 
 TEST(MessageLoopTest, WaitForIO) {
   RunTest_WaitForIO();
 }
 
 TEST(MessageLoopTest, HighResolutionTimer) {
   MessageLoop loop;
+  Time::EnableHighResolutionTimer(true);
 
   const TimeDelta kFastTimer = TimeDelta::FromMilliseconds(5);
   const TimeDelta kSlowTimer = TimeDelta::FromMilliseconds(100);
 
   EXPECT_FALSE(loop.HasHighResolutionTasks());
   // Post a fast task to enable the high resolution timers.
   loop.PostDelayedTask(FROM_HERE, Bind(&PostNTasksThenQuit, 1),
                        kFastTimer);
   EXPECT_TRUE(loop.HasHighResolutionTasks());
   loop.Run();
   EXPECT_FALSE(loop.HasHighResolutionTasks());
   EXPECT_FALSE(Time::IsHighResolutionTimerInUse());
   // Check that a slow task does not trigger the high resolution logic.
   loop.PostDelayedTask(FROM_HERE, Bind(&PostNTasksThenQuit, 1),
                        kSlowTimer);
   EXPECT_FALSE(loop.HasHighResolutionTasks());
   loop.Run();
   EXPECT_FALSE(loop.HasHighResolutionTasks());
+  Time::EnableHighResolutionTimer(false);
 }
 
 #endif  // defined(OS_WIN)
 
 #if defined(OS_POSIX) && !defined(OS_NACL)
 
 namespace {
 
 class QuitDelegate : public MessageLoopForIO::Watcher {
  public:
@@ skipping 248 matching lines @@
 
   ASSERT_TRUE(PostMessage(message_hwnd, kSignalMsg, 0, 1));
 
   loop.Run();
 
   ASSERT_TRUE(UnregisterClass(MAKEINTATOM(atom), instance));
 }
 #endif  // defined(OS_WIN)
 
 }  // namespace base