Expose Resume() in RenderProcessHost.

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 dca6c148fd0099de922908aa3806598dc86c3e92..30044475d285f8de818018af6970195383f9f99a 100644
--- a/content/child/child_thread_impl.cc
+++ b/content/child/child_thread_impl.cc
@@ -738,6 +738,7 @@ bool ChildThreadImpl::OnMessageReceived(const IPC::Message& msg) {
                         OnProcessBackgrounded)
     IPC_MESSAGE_HANDLER(ChildProcessMsg_PurgeAndSuspend,
                         OnProcessPurgeAndSuspend)
+    IPC_MESSAGE_HANDLER(ChildProcessMsg_Resume, OnProcessResume)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
 
@@ -770,6 +771,8 @@ void ChildThreadImpl::OnProcessBackgrounded(bool backgrounded) {
 void ChildThreadImpl::OnProcessPurgeAndSuspend() {
 }
 
+void ChildThreadImpl::OnProcessResume() {}
+
 void ChildThreadImpl::OnShutdown() {
   base::MessageLoop::current()->QuitWhenIdle();
 }