Pass real tilt information to PointerEvents.

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 27 matching lines @@
 
 class WebTouchPoint {
 public:
     WebTouchPoint()
         : id(0)
         , state(StateUndefined)
         , radiusX(0)
         , radiusY(0)
         , rotationAngle(0)
         , force(0)
+        , tilt(0)
+        , tiltRad(0)
+        , tiltOrientation(0)
+        , tiltOrientationRad(0)
+        , tiltX(0)
+        , tiltY(0)
     {
     }
 
     enum State {
         StateUndefined,
         StateReleased,
         StatePressed,
         StateMoved,
         StateStationary,
         StateCancelled,
     };
 
     int id;
     State state;
     WebFloatPoint screenPosition;
     WebFloatPoint position;
 
     float radiusX;
     float radiusY;
     float rotationAngle;
     float force;
+    // TODO(e_hakkinen): Leave only either tilt and tiltOrientation, tiltRad and
+    //                   tiltOrientationRad or tiltX and tiltY.
+    float tilt;
+    float tiltRad;
+    float tiltOrientation;
+    float tiltOrientationRad;
+    float tiltX;

[mustaq, 2015/06/17 19:43:28]

I think we should use type 'int' for tiltX and tiltY, to mimic the the PE spec.
The precision of 1-degree should be good enough for tilt in any use case, right?

[USE eero AT chromium.org, 2015/06/18 11:34:08]

Done.

+    float tiltY;
 };
 
 } // namespace blink
 
 #endif