touch: Make sure the correct radius values are used for touch events.

ui/aura/event.cc

Index: ui/aura/event.cc
diff --git a/ui/aura/event.cc b/ui/aura/event.cc
index 8a3bab0f7842004b6908a5f81e18ead4fa3dfa8f..2d148d1d442fef3faca35c110ecb6c726bcad987 100644
--- a/ui/aura/event.cc
+++ b/ui/aura/event.cc
@@ -271,8 +271,8 @@ TouchEvent::TouchEvent(ui::EventType type,
                        base::TimeDelta time_stamp)
     : LocatedEvent(type, location, location, 0),
       touch_id_(touch_id),
-      radius_x_(1.0f),
-      radius_y_(1.0f),
+      radius_x_(0.0f),
+      radius_y_(0.0f),
       rotation_angle_(0.0f),
       force_(0.0f) {
   set_time_stamp(time_stamp);
@@ -285,8 +285,8 @@ void TouchEvent::UpdateForRootTransform(const ui::Transform& root_transform) {
   LocatedEvent::UpdateForRootTransform(root_transform);
   gfx::Point3f scale;
   ui::InterpolatedTransform::FactorTRS(root_transform, NULL, NULL, &scale);
-  radius_x_ *= scale.x();
-  radius_y_ *= scale.y();
+  radius_x_ /= scale.x();

[sky, 2012/05/18 19:57:37]

Are we sure these are non-zero?

[sadrul, 2012/05/18 20:07:32]

Ah, good point. I think in normal cases, the scale is 1. But I have added a
check for non-zero scale before using it.

+  radius_y_ /= scale.y();
 }
 
 ui::EventType TouchEvent::GetEventType() const {