Add "previewing on hover" support for single-field autocomplete input

components/autofill/content/browser/autofill_driver_impl.cc

Index: components/autofill/content/browser/autofill_driver_impl.cc
diff --git a/components/autofill/content/browser/autofill_driver_impl.cc b/components/autofill/content/browser/autofill_driver_impl.cc
index b6d7cbc70d2a0036b8a16ee5bf19d76f58c94042..f348cf5954db2a4f7e0875e4ab03339dafadd779 100644
--- a/components/autofill/content/browser/autofill_driver_impl.cc
+++ b/components/autofill/content/browser/autofill_driver_impl.cc
@@ -172,6 +172,15 @@ void AutofillDriverImpl::RendererShouldSetNodeText(
   host->Send(new AutofillMsg_SetNodeText(host->GetRoutingID(), value));
 }
 
+void AutofillDriverImpl::RendererShouldPreviewAutoCompleteNode(
+    const base::string16& value) {
+  if (!RendererIsAvailable())
+    return;
+  content::RenderViewHost* host = web_contents()->GetRenderViewHost();
+  host->Send(new AutofillMsg_PreviewAutoCompleteNode(host->GetRoutingID(),
+                                                     value));
+}
+
 bool AutofillDriverImpl::OnMessageReceived(const IPC::Message& message) {
   bool handled = true;
   IPC_BEGIN_MESSAGE_MAP(AutofillDriverImpl, message)