Fix a few issues with touch-events and views-desktop.

views/touchui/gesture_manager.cc

Index: views/touchui/gesture_manager.cc
diff --git a/views/touchui/gesture_manager.cc b/views/touchui/gesture_manager.cc
index 3f70f301152d0dcebf9585eb13bc786545d5b541..830ce04d99864a4bdef649b9f0dbd634793b747c 100644
--- a/views/touchui/gesture_manager.cc
+++ b/views/touchui/gesture_manager.cc
@@ -32,9 +32,12 @@ bool GestureManager::ProcessTouchEventForGesture(const TouchEvent& event,
   // event distribution code works by turning all touch inputs into
   // mouse approximations.
 
+  // Conver the touch-event into a mouse-event. This mouse-event gets its
+  // location information from the native-event, so it needs to drop on the
+  // toplevel widget instead of just source->GetWidget.
   Event::FromNativeEvent2 from_native;
   MouseEvent mouseev(event, from_native);
-  source->GetWidget()->OnMouseEvent(mouseev);
+  source->GetWidget()->GetTopLevelWidget()->OnMouseEvent(mouseev);
   return true;
 }