Pass real tilt information to PointerEvents.

public/platform/WebPointerProperties.h

 // Copyright (c) 2015 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 WebPointerProperties_h
 #define WebPointerProperties_h
 
 namespace blink {
 
 // This class encapsulates the properties that are common between mouse and
 // pointer events and touch points as we transition towards the unified pointer
 // event model.
 // TODO(e_hakkinen): Replace WebTouchEvent with WebPointerEvent, remove
 // WebTouchEvent and WebTouchPoint and merge this into WebPointerEvent.
 class WebPointerProperties {
 public:
     WebPointerProperties()
         : button(ButtonNone)
         , id(0)
         , force(0.f)
+        , tiltX(0)
+        , tiltY(0)
     {
     }
 
     enum Button {
         ButtonNone = -1,
         ButtonLeft,
         ButtonMiddle,
         ButtonRight
     };
 
     Button button;
 
     int id;
     float force;
+    int tiltX;

[Rick Byers, 2015/07/27 14:14:19]

Since these are new, can you please add some comments here briefly describing
their semantics (units, range, etc.)?

[USE eero AT chromium.org, 2015/07/27 17:53:36]

Done.

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