Identify context menus being opened via the long press gesture

content/renderer/input/render_widget_input_handler.cc

Index: content/renderer/input/render_widget_input_handler.cc
diff --git a/content/renderer/input/render_widget_input_handler.cc b/content/renderer/input/render_widget_input_handler.cc
index d5d5255c02f9c864a383a94ca1745f640d47461b..6c56a6f00200eb3f60c9503ca0ef0102d9ece543 100644
--- a/content/renderer/input/render_widget_input_handler.cc
+++ b/content/renderer/input/render_widget_input_handler.cc
@@ -294,7 +294,9 @@ void RenderWidgetInputHandler::HandleInputEvent(
   if (WebInputEvent::isGestureEventType(input_event.type)) {
     const WebGestureEvent& gesture_event =
         static_cast<const WebGestureEvent&>(input_event);
-    context_menu_source_type_ = ui::MENU_SOURCE_TOUCH;
+    context_menu_source_type_ =
+        ((input_event.type == WebInputEvent::GestureLongPress) ?
+              ui::MENU_SOURCE_LONG_PRESS : ui::MENU_SOURCE_TOUCH);
     prevent_default =
         prevent_default || delegate_->WillHandleGestureEvent(gesture_event);
   }