Add support for the cgroups config we have in chromeos

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 1b65c72b69c0cafad0951cd26d4c72d0b6766030..171cbd78303944b283308a91b241bcb40b696889 100644
--- a/content/browser/child_process_launcher.cc
+++ b/content/browser/child_process_launcher.cc
@@ -245,6 +245,11 @@ class ChildProcessLauncher::Context
     process_.set_handle(base::kNullProcessHandle);
   }
 
+  void SetProcessBackgrounded(bool background) {
+    DCHECK(!starting_);
+    process_.SetProcessBackgrounded(background);
+  }
+
   static void TerminateInternal(
 #if defined(OS_LINUX)
       bool zygote,
@@ -343,6 +348,10 @@ base::TerminationStatus ChildProcessLauncher::GetChildTerminationStatus(
 }
 
 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));
 }