Add tilt_x and tilt_y to ppapi touchpoint.

ppapi/cpp/touch_point.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef PPAPI_CPP_TOUCH_POINT_H_
 #define PPAPI_CPP_TOUCH_POINT_H_
 
 #include <stdint.h>
 
 #include "ppapi/c/ppb_input_event.h"
 #include "ppapi/cpp/input_event.h"
 #include "ppapi/cpp/point.h"
 
 namespace pp {
 
 /// Wrapper class for PP_TouchPoint.
 class TouchPoint {
  public:
   TouchPoint() : touch_point_(PP_MakeTouchPoint()) {}
 
-  TouchPoint(const PP_TouchPoint& point) : touch_point_(point) {}
+  TouchPoint(const PP_TouchPoint& point)
+      : touch_point_(point), tilt_(PP_MakeFloatPoint(0, 0)) {}
+
+  TouchPoint(const PP_TouchPoint& point, const PP_FloatPoint& tilt)
+      : touch_point_(point), tilt_(tilt) {}
 
   /// @return The identifier for this TouchPoint. This corresponds to the order
   /// in which the points were pressed. For example, the first point to be
   /// pressed has an id of 0, the second has an id of 1, and so on. An id can be
   /// reused when a touch point is released.  For example, if two fingers are
   /// down, with id 0 and 1, and finger 0 releases, the next finger to be
   /// pressed can be assigned to id 0.
   uint32_t id() const { return touch_point_.id; }
 
   /// @return The x-y coordinates of this TouchPoint, in DOM coordinate space.
   FloatPoint position() const {
     return pp::FloatPoint(touch_point_.position);
   }
 
   /// @return The elliptical radii, in screen pixels, in the x and y direction
   /// of this TouchPoint.
   FloatPoint radii() const { return pp::FloatPoint(touch_point_.radius); }
 
   /// @return The angle of rotation of the elliptical model of this TouchPoint
   /// from the y-axis.
   float rotation_angle() const { return touch_point_.rotation_angle; }
 
   /// @return The pressure applied to this TouchPoint.  This is typically a
   /// value between 0 and 1, with 0 indicating no pressure and 1 indicating
   /// some maximum pressure, but scaling differs depending on the hardware and
   /// the value is not guaranteed to stay within that range.
   float pressure() const { return touch_point_.pressure; }
 
+  /// @return The tilt of this touchpoint. This is a float point. Values of x
+  /// and y are between 0 and 90, with 0 indicating 0 degrees and 90 indicating
+  //  90 degrees.
+  PP_FloatPoint tilt() const { return tilt_; }
+
  private:
   PP_TouchPoint touch_point_;
+  PP_FloatPoint tilt_;
 };
 
 }  // namespace pp
 
 #endif  /* PPAPI_CPP_TOUCH_POINT_H_ */