Do not set background priority in-process on Windows

content/child/child_thread.cc

 // Copyright (c) 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.
 
 #include "content/child/child_thread.h"
 
 #include <signal.h>
 
 #include <string>
 
@@ skipping 549 matching lines @@
 void ChildThread::OnProcessBackgrounded(bool background) {
   // Set timer slack to maximum on main thread when in background.
   base::TimerSlack timer_slack = base::TIMER_SLACK_NONE;
   if (background)
     timer_slack = base::TIMER_SLACK_MAXIMUM;
   base::MessageLoop::current()->SetTimerSlack(timer_slack);
 
 #ifdef OS_WIN
   // Windows Vista+ has a fancy process backgrounding mode that can only be set
   // from within the process.
-  base::Process::Current().SetProcessBackgrounded(background);
+  // TODO(wfh) Do not set background from within process until the issue with
+  // white tabs is resolved.  See http://crbug.com/398103.
+  // base::Process::Current().SetProcessBackgrounded(background);
 #endif  // OS_WIN
 }
 
 }  // namespace content