Resume a backgrounded renderer that was purged and suspended

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 3b534c22097ec72dedeaf8c4cffe7fd584c18f30..32b339125b329ea3c75e31efc733b887ebaff839 100644
--- a/content/child/child_thread_impl.cc
+++ b/content/child/child_thread_impl.cc
@@ -782,6 +782,7 @@ 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()
 
@@ -814,6 +815,8 @@ void ChildThreadImpl::OnProcessBackgrounded(bool backgrounded) {
 void ChildThreadImpl::OnProcessPurgeAndSuspend() {
 }
 
+void ChildThreadImpl::OnProcessResume() {}
+
 void ChildThreadImpl::OnShutdown() {
   base::MessageLoop::current()->QuitWhenIdle();
 }