Added experimental tilt and tiltDirection to the Touch interface

public/web/WebTouchPoint.h

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 15 matching lines @@
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef WebTouchPoint_h
 #define WebTouchPoint_h
 
 #include "../platform/WebCommon.h"
 #include "../platform/WebFloatPoint.h"
+#include <limits>
 
 namespace blink {
 
 class WebTouchPoint {
 public:
     WebTouchPoint()
         : id(0)
         , state(StateUndefined)
         , radiusX(0)
         , radiusY(0)
         , rotationAngle(0)
         , force(0)
+        , tilt(std::numeric_limits<float>::quiet_NaN())
+        , tiltDirection(std::numeric_limits<float>::quiet_NaN())
     {
     }
 
     enum State {
         StateUndefined,
         StateReleased,
         StatePressed,
         StateMoved,
         StateStationary,
         StateCancelled,
     };
 
     int id;
     State state;
     WebFloatPoint screenPosition;
     WebFloatPoint position;
 
     float radiusX;
     float radiusY;
     float rotationAngle;
     float force;
+    float tilt;
+    float tiltDirection;
 };
 
 } // namespace blink
 
 #endif