Update EventSender::GestureTap to return a bool (if handled).

content/shell/renderer/test_runner/event_sender.cc

Index: content/shell/renderer/test_runner/event_sender.cc
diff --git a/content/shell/renderer/test_runner/event_sender.cc b/content/shell/renderer/test_runner/event_sender.cc
index 9646019048df4f3169433a53ef7a50947d4af6db..63cd6fe61f254ecd57173cc12ae05ae8fb098e0c 100644
--- a/content/shell/renderer/test_runner/event_sender.cc
+++ b/content/shell/renderer/test_runner/event_sender.cc
@@ -2067,7 +2067,7 @@ void EventSender::GestureEvent(WebInputEvent::Type type,
   if (force_layout_on_events_)
     view_->layout();
 
-  view_->handleInputEvent(event);
+  bool result = view_->handleInputEvent(event);
 
   // Long press might start a drag drop session. Complete it if so.
   if (type == WebInputEvent::GestureLongPress && !current_drag_data_.isNull()) {
@@ -2082,6 +2082,7 @@ void EventSender::GestureEvent(WebInputEvent::Type type,
 
     FinishDragAndDrop(mouse_event, blink::WebDragOperationNone);
   }
+  args->Return(result);
 }
 
 void EventSender::UpdateClickCountForButton(