Added experimental Touch.tilt, Touch.tiltDirection support for Android

ui/events/event_utils.h

Index: ui/events/event_utils.h
diff --git a/ui/events/event_utils.h b/ui/events/event_utils.h
index 1649bd7eed5364c931f590f472896035eedf6391..0bd1aee4eca460dc4987e64aba1e0c6928aafd57 100644
--- a/ui/events/event_utils.h
+++ b/ui/events/event_utils.h
@@ -127,6 +127,15 @@ EVENTS_EXPORT float GetTouchRadiusY(const base::NativeEvent& native_event);
 // Gets the angle of the major axis away from the X axis. Default is 0.0.
 EVENTS_EXPORT float GetTouchAngle(const base::NativeEvent& native_event);
 
+// Gets the tilt angle of the stylus away from the perpendicular to the screen
+// Default is NaN.
+EVENTS_EXPORT float GetTouchTilt(const base::NativeEvent& native_event);
+
+// Gets the clockwise angle from the X axis to the XY-projection of the stylus.
+// Range is [-180, 180), default is NaN.
+EVENTS_EXPORT float GetTouchTiltDirection(
+    const base::NativeEvent& native_event);
+
 // Gets the force from a native_event. Normalized to be [0, 1]. Default is 0.0.
 EVENTS_EXPORT float GetTouchForce(const base::NativeEvent& native_event);