Add support for real-time audio threads.

base/threading/platform_thread_win.cc

Index: base/threading/platform_thread_win.cc
===================================================================
--- base/threading/platform_thread_win.cc	(revision 83935)
+++ base/threading/platform_thread_win.cc	(working copy)
@@ -1,4 +1,4 @@
-// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// Copyright (c) 2011 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.
 
@@ -144,4 +144,9 @@
   CloseHandle(thread_handle);
 }
 
+// static
+void PlatformThread::EnableRealtimeAudioPerformance(PlatformThreadHandle) {
+  // TODO(crogers): implement
+}
+
 }  // namespace base