Added experimental tilt and tiltDirection to the Touch interface

Source/core/dom/Touch.h

Index: Source/core/dom/Touch.h
diff --git a/Source/core/dom/Touch.h b/Source/core/dom/Touch.h
index 8e54087832ae1da717c9616fa1aad298c40c1e41..2d1480454e792f961fac8b50f05485c40aa7abab 100644
--- a/Source/core/dom/Touch.h
+++ b/Source/core/dom/Touch.h
@@ -45,10 +45,10 @@ class Touch final : public RefCountedWillBeGarbageCollected<Touch>, public Scrip
 public:
     static PassRefPtrWillBeRawPtr<Touch> create(LocalFrame* frame, EventTarget* target,
         unsigned identifier, const FloatPoint& screenPos, const FloatPoint& pagePos,
-        const FloatSize& radius, float rotationAngle, float force)
+        const FloatSize& radius, float rotationAngle, float tilt, float force)
     {
         return adoptRefWillBeNoop(
-            new Touch(frame, target, identifier, screenPos, pagePos, radius, rotationAngle, force));
+            new Touch(frame, target, identifier, screenPos, pagePos, radius, rotationAngle, tilt, force));
     }
 
     // DOM Touch implementation
@@ -67,6 +67,7 @@ public:
     float webkitRotationAngle() const { return m_rotationAngle; }
     float force() const { return m_force; }
     float webkitForce() const { return m_force; }
+    float tilt() const { return m_tilt; }
 
     // Blink-internal methods
     const LayoutPoint& absoluteLocation() const { return m_absoluteLocation; }
@@ -78,11 +79,11 @@ public:
 private:
     Touch(LocalFrame* frame, EventTarget* target, unsigned identifier,
         const FloatPoint& screenPos, const FloatPoint& pagePos,
-        const FloatSize& radius, float rotationAngle, float force);
+        const FloatSize& radius, float rotationAngle, float tilt, float force);
 
     Touch(EventTarget*, unsigned identifier, const FloatPoint& clientPos,
         const FloatPoint& screenPos, const FloatPoint& pagePos,
-        const FloatSize& radius, float rotationAngle, float force, LayoutPoint absoluteLocation);
+        const FloatSize& radius, float rotationAngle, float tilt, float force, LayoutPoint absoluteLocation);
 
     RefPtrWillBeMember<EventTarget> m_target;
     unsigned m_identifier;
@@ -95,6 +96,7 @@ private:
     // Radius in CSS px.
     FloatSize m_radius;
     float m_rotationAngle;
+    float m_tilt;
     float m_force;
     // FIXME(rbyers): Shouldn't we be able to migrate callers to relying on screenPos, pagePos
     // or clientPos? absoluteLocation appears to be the same as pagePos but without browser