diff -r 000000000000 -r 6474c204b198 xpcom/threads/moz.build
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/xpcom/threads/moz.build	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,63 @@
+# -*- Mode: python; c-basic-offset: 4; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+XPIDL_SOURCES += [
+    'nsICancelableRunnable.idl',
+    'nsIEnvironment.idl',
+    'nsIEventTarget.idl',
+    'nsIProcess.idl',
+    'nsIRunnable.idl',
+    'nsISupportsPriority.idl',
+    'nsIThread.idl',
+    'nsIThreadInternal.idl',
+    'nsIThreadManager.idl',
+    'nsIThreadPool.idl',
+    'nsITimer.idl',
+]
+
+XPIDL_MODULE = 'xpcom_threads'
+
+EXPORTS += [
+    'nsEventQueue.h',
+    'nsMemoryPressure.h',
+    'nsProcess.h',
+    'nsThread.h',
+]
+
+EXPORTS.mozilla += [
+    'BackgroundHangMonitor.h',
+    'HangMonitor.h',
+    'LazyIdleThread.h',
+    'SyncRunnable.h',
+]
+
+UNIFIED_SOURCES += [
+    'BackgroundHangMonitor.cpp',
+    'HangMonitor.cpp',
+    'LazyIdleThread.cpp',
+    'nsEnvironment.cpp',
+    'nsEventQueue.cpp',
+    'nsMemoryPressure.cpp',
+    'nsProcessCommon.cpp',
+    'nsThread.cpp',
+    'nsThreadManager.cpp',
+    'nsThreadPool.cpp',
+    'nsTimerImpl.cpp',
+    'ThreadStackHelper.cpp',
+    'TimerThread.cpp',
+]
+
+MSVC_ENABLE_PGO = True
+
+LOCAL_INCLUDES += [
+    '../build',
+]
+
+FAIL_ON_WARNINGS = True
+
+FINAL_LIBRARY = 'xpcom_core'
+
+include('/ipc/chromium/chromium-config.mozbuild')