[autofill] Adding new API to request an interactive autocomplete UI flow.

content/renderer/render_view_impl.cc

Index: content/renderer/render_view_impl.cc
diff --git a/content/renderer/render_view_impl.cc b/content/renderer/render_view_impl.cc
index f6ddf8a6f8b1fe87b115a019406773c6c8c6199b..3b9a741f98573099cc02fc7b4fbe02a060c77e01 100644
--- a/content/renderer/render_view_impl.cc
+++ b/content/renderer/render_view_impl.cc
@@ -2190,6 +2190,12 @@ bool RenderViewImpl::runModalBeforeUnloadDialog(
   return success;
 }
 
+void RenderViewImpl::requestAutocomplete(
+    WebFrame* frame, const WebFormElement& form) {
+  FOR_EACH_OBSERVER(
+      RenderViewObserver, observers_, RequestAutocomplete(frame, form));
+}
+
 void RenderViewImpl::showContextMenu(
     WebFrame* frame, const WebContextMenuData& data) {
   // TODO(fsamuel): In the future, we might want the embedder to be able to