Correct missing radius in ui::TouchEvent.

ui/events/event.h

Index: ui/events/event.h
diff --git a/ui/events/event.h b/ui/events/event.h
index 757d992c6afadea723c2629e56003c60ae1a7f02..2ad02fdb2e0b8960d9489f350bc77b9c00897127 100644
--- a/ui/events/event.h
+++ b/ui/events/event.h
@@ -518,8 +518,10 @@ class EVENTS_EXPORT TouchEvent : public LocatedEvent {
   int touch_id() const { return touch_id_; }
   // A unique identifier for this event.
   uint64 unique_event_id() const { return unique_event_id_; }
-  float radius_x() const { return radius_x_; }
-  float radius_y() const { return radius_y_; }
+  // If we aren't provided with a radius on one axis, use the
+  // information from the other axis.
+  float radius_x() const { return radius_x_ > 0 ? radius_x_ : radius_y_; }
+  float radius_y() const { return radius_y_ > 0 ? radius_y_ : radius_x_; }
   float rotation_angle() const { return rotation_angle_; }
   float force() const { return force_; }