Fixed ui::TouchEvent rotation angle out-of-bound issue.

ui/events/event.h

Index: ui/events/event.h
diff --git a/ui/events/event.h b/ui/events/event.h
index 754f5c90aaaddd879d5ae7a9888a0b2631302cd9..81b57bef60cf20e828b7f93350b792a4f0d756f3 100644
--- a/ui/events/event.h
+++ b/ui/events/event.h
@@ -550,6 +550,7 @@ class EVENTS_EXPORT TouchEvent : public LocatedEvent {
 
   void set_rotation_angle(float rotation_angle) {
     rotation_angle_ = rotation_angle;
+    fixRotationAngle();
   }
 
   void set_force(float force) { force_ = force; }
@@ -578,6 +579,10 @@ class EVENTS_EXPORT TouchEvent : public LocatedEvent {
   // touchmove that exceeds the platform slop region, or a touchend that
   // causes a fling). Defaults to false.
   bool may_cause_scrolling_;
+
+  // Adjusts rotation_angle_ to within the spec limits:
+  // https://dvcs.w3.org/hg/webevents/raw-file/default/touchevents.html

[tdresser, 2015/01/16 20:29:52]

As we're in the ui layer here, I don't think we want to reference web specific
requirements.

Just state that we ensure the rotation angle is between 0 and 90.

+  void fixRotationAngle();
 };
 
 // An interface that individual platforms can use to store additional data on