Propagate touch area to WebKit for GestureTapDown event

content/browser/renderer_host/web_input_event_aurax11.cc

Index: content/browser/renderer_host/web_input_event_aurax11.cc
diff --git a/content/browser/renderer_host/web_input_event_aurax11.cc b/content/browser/renderer_host/web_input_event_aurax11.cc
index 67e04a11482df146008fdcc489b1b723edb1fb3e..41050583b4d839df367f9b36bf3a5d8cdc87c373 100644
--- a/content/browser/renderer_host/web_input_event_aurax11.cc
+++ b/content/browser/renderer_host/web_input_event_aurax11.cc
@@ -354,6 +354,10 @@ WebKit::WebGestureEvent MakeWebGestureEventFromAuraEvent(
       break;
     case ui::ET_GESTURE_TAP_DOWN:
       gesture_event.type = WebKit::WebInputEvent::GestureTapDown;
+      gesture_event.data.tapDown.width =
+          event->details().bounding_box().width();
+      gesture_event.data.tapDown.height =
+          event->details().bounding_box().height();
       break;
     case ui::ET_GESTURE_TAP_CANCEL:
       gesture_event.type = WebKit::WebInputEvent::GestureTapCancel;