Experimental 'purging and suspending' backgrounded tabs behind the flag

content/browser/renderer_host/render_process_host_impl.cc

Index: content/browser/renderer_host/render_process_host_impl.cc
diff --git a/content/browser/renderer_host/render_process_host_impl.cc b/content/browser/renderer_host/render_process_host_impl.cc
index 06aadbae41cb0ceb098b7a751bcc4f84ce03ec0e..b4c9fb9c4e51ae182cbffad1ceef9e0cb8fee732 100644
--- a/content/browser/renderer_host/render_process_host_impl.cc
+++ b/content/browser/renderer_host/render_process_host_impl.cc
@@ -1127,6 +1127,10 @@ void RenderProcessHostImpl::DecrementWorkerRefCount() {
     Cleanup();
 }
 
+void RenderProcessHostImpl::PurgeAndSuspend() {
+  Send(new ChildProcessMsg_PurgeAndSuspend());
+}
+
 void RenderProcessHostImpl::AddRoute(int32_t routing_id,
                                      IPC::Listener* listener) {
   CHECK(!listeners_.Lookup(routing_id)) << "Found Routing ID Conflict: "