Add support for backgrounding processes on the Mac

content/browser/child_process_launcher.cc

Index: content/browser/child_process_launcher.cc
diff --git a/content/browser/child_process_launcher.cc b/content/browser/child_process_launcher.cc
index 28be72bb9c32eb853702adbdb0726379a3f9825c..23cf832e6652d9ab198cb85b7749bcdcc4aeda9c 100644
--- a/content/browser/child_process_launcher.cc
+++ b/content/browser/child_process_launcher.cc
@@ -1,4 +1,4 @@
-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Copyright 2012 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.
 
@@ -269,7 +269,15 @@ void TerminateOnLauncherThread(bool zygote, base::Process process) {
 void SetProcessBackgroundedOnLauncherThread(base::Process process,
                                             bool background) {
   DCHECK_CURRENTLY_ON(BrowserThread::PROCESS_LAUNCHER);
+#if defined(OS_MACOSX)
+  MachBroker* broker = MachBroker::GetInstance();
+  mach_port_t task_port = broker->TaskForPid(process.Pid());
+  if (task_port != TASK_NULL) {
+    process.SetProcessBackgrounded(task_port, background);
+  }
+#else
   process.SetProcessBackgrounded(background);
+#endif  // defined(OS_MACOSX)
 #if defined(OS_ANDROID)
   SetChildProcessInForeground(process.Handle(), !background);
 #endif