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

content/browser/renderer_host/render_view_host_delegate.h

Index: content/browser/renderer_host/render_view_host_delegate.h
diff --git a/content/browser/renderer_host/render_view_host_delegate.h b/content/browser/renderer_host/render_view_host_delegate.h
index 61cdc1406eea56997b51b59cf0faddfd8cda0b74..f9aa54a74e7c9e8bf25bb2ff7a2950b7862e6047 100644
--- a/content/browser/renderer_host/render_view_host_delegate.h
+++ b/content/browser/renderer_host/render_view_host_delegate.h
@@ -416,6 +416,9 @@ class CONTENT_EXPORT RenderViewHostDelegate {
       const MediaStreamRequest* request,
       const MediaResponseCallback& callback) {}
 
+  // The render view wants to interactively autocomplete part of a form.
+  virtual void RequestAutocomplete() {}
+
 #if defined(OS_ANDROID)
   virtual void AttachLayer(WebKit::WebLayer* layer) {}
   virtual void RemoveLayer(WebKit::WebLayer* layer) {}