Added experimental Touch.tilt, Touch.tiltDirection support for Android

ui/events/event.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 UI_EVENTS_EVENT_H_
 #define UI_EVENTS_EVENT_H_
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/event_types.h"
@@ skipping 477 matching lines @@
   // converted from |source| coordinate system to |target| coordinate system.
   template <class T>
   TouchEvent(const TouchEvent& model, T* source, T* target)
       : LocatedEvent(model, source, target),
         touch_id_(model.touch_id_),
         unique_event_id_(model.unique_event_id_),
         radius_x_(model.radius_x_),
         radius_y_(model.radius_y_),
         rotation_angle_(model.rotation_angle_),
         force_(model.force_),
+        tilt_(model.tilt_),
+        tiltDirection_(model.tiltDirection_),
         may_cause_scrolling_(model.may_cause_scrolling_) {}
 
   TouchEvent(EventType type,
              const gfx::PointF& location,
              int touch_id,
              base::TimeDelta time_stamp);
 
   TouchEvent(EventType type,
              const gfx::PointF& location,
              int flags,
              int touch_id,
              base::TimeDelta timestamp,
              float radius_x,
              float radius_y,
              float angle,
-             float force);
+             float force,
+             float tilt,
+             float tiltDirection);
 
   ~TouchEvent() override;
 
   // The id of the pointer this event modifies.
   int touch_id() const { return touch_id_; }
   // A unique identifier for this event.
   uint64 unique_event_id() const { return unique_event_id_; }
   // If we aren't provided with a radius on one axis, use the
   // information from the other axis.
   float radius_x() const { return radius_x_ > 0 ? radius_x_ : radius_y_; }
   float radius_y() const { return radius_y_ > 0 ? radius_y_ : radius_x_; }
   float rotation_angle() const { return rotation_angle_; }
   float force() const { return force_; }
+  float tilt() const { return tilt_; }
+  float tiltDirection() const { return tiltDirection_; }
 
   void set_may_cause_scrolling(bool causes) { may_cause_scrolling_ = causes; }
   bool may_cause_scrolling() const { return may_cause_scrolling_; }
 
   // Used for unit tests.
   void set_radius_x(const float r) { radius_x_ = r; }
   void set_radius_y(const float r) { radius_y_ = r; }
 
   // Overridden from LocatedEvent.
   void UpdateForRootTransform(
@@ skipping 22 matching lines @@
   // Radius of the Y (minor) axis of the touch ellipse. 0.0 if unknown.
   float radius_y_;
 
   // Clockwise angle (in degrees) of the major axis from the X axis. Must be
   // less than 180 and non-negative.
   float rotation_angle_;
 
   // Force (pressure) of the touch. Normalized to be [0, 1]. Default to be 0.0.
   float force_;
 
+  // Tilt angle of the stylus away from the perpendicular to the screen.
+  // Default is NaN.
+  float tilt_;
+
+  // Clockwise angle from the X axis to the XY-projection of the stylus.
+  // Range is [-180, 180), default is NaN.
+  float tiltDirection_;
+
   // Whether the (unhandled) touch event will produce a scroll event (e.g., a
   // touchmove that exceeds the platform slop region, or a touchend that
   // causes a fling). Defaults to false.
   bool may_cause_scrolling_;
 };
 
 // An interface that individual platforms can use to store additional data on
 // KeyEvent.
 //
 // Currently only used in mojo.
@@ skipping 286 matching lines @@
 
   const GestureEventDetails& details() const { return details_; }
 
  private:
   GestureEventDetails details_;
 };
 
 }  // namespace ui
 
 #endif  // UI_EVENTS_EVENT_H_