Move responsiblity of tab suspending from renderer to TabManager

content/child/child_thread_impl.cc

Index: content/child/child_thread_impl.cc
diff --git a/content/child/child_thread_impl.cc b/content/child/child_thread_impl.cc
index d3f45dfc80278bc47ad19b6d3fcb3444f4e41f4d..7e2346f52be69671bd364d4a87ae7919d300954e 100644
--- a/content/child/child_thread_impl.cc
+++ b/content/child/child_thread_impl.cc
@@ -637,6 +637,8 @@ bool ChildThreadImpl::OnMessageReceived(const IPC::Message& msg) {
                         OnProfilingPhaseCompleted)
     IPC_MESSAGE_HANDLER(ChildProcessMsg_SetProcessBackgrounded,
                         OnProcessBackgrounded)
+    IPC_MESSAGE_HANDLER(ChildProcessMsg_Suspend,
+                        OnProcessSuspend)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
 
@@ -661,6 +663,9 @@ void ChildThreadImpl::OnProcessBackgrounded(bool backgrounded) {
   base::MessageLoop::current()->SetTimerSlack(timer_slack);
 }
 
+void ChildThreadImpl::OnProcessSuspend() {
+}
+
 void ChildThreadImpl::OnShutdown() {
   base::MessageLoop::current()->QuitWhenIdle();
 }