Add support for the cgroups config we have in chromeos

content/browser/child_process_launcher.cc

 // Copyright (c) 2010 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/browser/child_process_launcher.h"
 
 #include <utility>  // For std::pair.
 
 #include "base/command_line.h"
 #include "base/logging.h"
@@ skipping 227 matching lines @@
         BrowserThread::PROCESS_LAUNCHER, FROM_HERE,
         NewRunnableFunction(
             &ChildProcessLauncher::Context::TerminateInternal,
 #if defined(OS_LINUX)
             zygote_,
 #endif
             process_.handle()));
     process_.set_handle(base::kNullProcessHandle);
   }
 
+  void SetProcessBackgrounded(bool background) {
+    DCHECK(!starting_);
+    process_.SetProcessBackgrounded(background);
+  }
+
   static void TerminateInternal(
 #if defined(OS_LINUX)
       bool zygote,
 #endif
       base::ProcessHandle handle) {
     base::Process process(handle);
      // Client has gone away, so just kill the process.  Using exit code 0
     // means that UMA won't treat this as a crash.
     process.Terminate(ResultCodes::NORMAL_EXIT);
     // On POSIX, we must additionally reap the child.
@@ skipping 78 matching lines @@
   // it'll reap the process.  However, if GetTerminationStatus didn't
   // reap the child (because it was still running), we'll need to
   // Terminate via ProcessWatcher. So we can't close the handle here.
   if (status != base::TERMINATION_STATUS_STILL_RUNNING)
     context_->process_.Close();
 
   return status;
 }
 
 void ChildProcessLauncher::SetProcessBackgrounded(bool background) {
-  DCHECK(!context_->starting_);
-  context_->process_.SetProcessBackgrounded(background);
+  BrowserThread::PostTask(
+      BrowserThread::PROCESS_LAUNCHER, FROM_HERE,
+      NewRunnableMethod(
+          context_.get(),
+          &ChildProcessLauncher::Context::SetProcessBackgrounded,
+          background));
 }