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

ui/events/x/events_x.cc

 // 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.
 
 #include "ui/events/event_constants.h"
 
 #include <cmath>
 #include <string.h>
 #include <X11/extensions/XInput.h>
 #include <X11/extensions/XInput2.h>
@@ skipping 780 matching lines @@
       ui::DeviceDataManagerX11::DT_TOUCH_MINOR, 0.0) / 2.0;
   ScaleTouchRadius(native_event, &radius);
   return radius;
 }
 
 float GetTouchAngle(const base::NativeEvent& native_event) {
   return GetTouchParamFromXEvent(native_event,
       ui::DeviceDataManagerX11::DT_TOUCH_ORIENTATION, 0.0) / 2.0;
 }
 
+float GetTouchTilt(const base::NativeEvent& native_event) {
+  NOTIMPLEMENTED();
+  return 0.0f;
+}
+
 float GetTouchForce(const base::NativeEvent& native_event) {
   double force = 0.0;
   force = GetTouchParamFromXEvent(native_event,
       ui::DeviceDataManagerX11::DT_TOUCH_PRESSURE, 0.0);
   unsigned int deviceid =
       static_cast<XIDeviceEvent*>(native_event->xcookie.data)->sourceid;
   // Force is normalized to fall into [0, 1]
   if (!ui::DeviceDataManagerX11::GetInstance()->NormalizeData(
       deviceid, ui::DeviceDataManagerX11::DT_TOUCH_PRESSURE, &force))
     force = 0.0;
@@ skipping 103 matching lines @@
       xievent->detail =
           UpdateX11EventButton(event->changed_button_flags(), xievent->detail);
       break;
     }
     default:
       break;
   }
 }
 
 }  // namespace ui