Added experimental tilt and tiltDirection to the Touch interface

Source/platform/PlatformTouchPoint.h

Index: Source/platform/PlatformTouchPoint.h
diff --git a/Source/platform/PlatformTouchPoint.h b/Source/platform/PlatformTouchPoint.h
index 578f520d77140d0cdb3457b329f5f6db7c5cb18a..a2eeb95a436c88cbe2255eea9c2231aa8e6e200f 100644
--- a/Source/platform/PlatformTouchPoint.h
+++ b/Source/platform/PlatformTouchPoint.h
@@ -40,6 +40,8 @@ public:
         : m_id(0)
         , m_rotationAngle(0)
         , m_force(0)
+        , m_tilt(0)
+        , m_tiltDirection(0)
     {
     }
 
@@ -50,6 +52,8 @@ public:
     FloatSize radius() const { return m_radius; }
     float rotationAngle() const { return m_rotationAngle; }
     float force() const { return m_force; }
+    float tilt() const { return m_tilt; }
+    float tiltDirection() const { return m_tiltDirection; }
 
 protected:
     unsigned m_id;
@@ -59,6 +63,8 @@ protected:
     FloatSize m_radius;
     float m_rotationAngle;
     float m_force;
+    float m_tilt;
+    float m_tiltDirection;
 };
 
 }