Add tilt_x and tilt_y to ppapi touchpoint.

ppapi/cpp/touch_point.h

Index: ppapi/cpp/touch_point.h
diff --git a/ppapi/cpp/touch_point.h b/ppapi/cpp/touch_point.h
index 66c512ba7d56c4e9841229d620eee2ee482d4327..0ca47553db23cdfc649754429befca2855c3b8bc 100644
--- a/ppapi/cpp/touch_point.h
+++ b/ppapi/cpp/touch_point.h
@@ -18,7 +18,10 @@ 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_{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
@@ -47,8 +50,17 @@ class TouchPoint {
   /// the value is not guaranteed to stay within that range.
   float pressure() const { return touch_point_.pressure; }
 
+  /// @return The tilt_x of this TouchPoint. This is typically a value between 0
+  /// and 90, with 0 indiciating 0 degree and 90 indicate 90 degrees.

[bbudge, 2017/05/19 22:52:47]

nit s/degree/degrees

and below

[jkwang, 2017/05/23 04:07:44]

Done.

+  float tilt_x() const { return tilt_.x; }
+
+  /// @return The tilt_y of this TouchPoint. This is typically a value between 0
+  /// and 90, with 0 indiciating 0 degree and 90 indicate 90 degrees.
+  float tilt_y() const { return tilt_.y; }
+
  private:
   PP_TouchPoint touch_point_;
+  PP_FloatPoint tilt_;
 };
 
 }  // namespace pp