Experimental 'purging and suspending' backgrounded tabs behind the flag

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 b7aa75e4f8fb60c830c520f87e932987936424c7..00ee6108a4e75ae0c84a49b04c5ad80e0647acfc 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_PurgeAndSuspend,
+                        OnProcessPurgeAndSuspend)
     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::OnProcessPurgeAndSuspend() {
+}
+
 void ChildThreadImpl::OnShutdown() {
   base::MessageLoop::current()->QuitWhenIdle();
 }