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

content/browser/renderer_host/input/motion_event_web.cc

 // Copyright 2014 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.
 
 // MSVC++ requires this to be set before any other includes to get M_PI.
 #define _USE_MATH_DEFINES
 
 #include "content/browser/renderer_host/input/motion_event_web.h"
 
 #include <cmath>
@@ skipping 119 matching lines @@
       > event_.touches[pointer_index].radiusY) {
     // The case radiusX == radiusY is omitted from here on purpose: for circles,
     // we want to pass the angle (which could be any value in such cases but
     // always seem to be set to zero) unchanged.
     rotation_angle_rad -= (float) M_PI_2;
   }
 
   return rotation_angle_rad;
 }
 
+float MotionEventWeb::GetTilt(size_t pointer_index) const {
+  return 0.f;
+}
+
 float MotionEventWeb::GetPressure(size_t pointer_index) const {
   return 0.f;
 }
 
 base::TimeTicks MotionEventWeb::GetEventTime() const {
   return base::TimeTicks() +
          base::TimeDelta::FromMicroseconds(event_.timeStampSeconds *
                                            base::Time::kMicrosecondsPerSecond);
 }
 
 ui::MotionEvent::ToolType MotionEventWeb::GetToolType(
     size_t pointer_index) const {
   // TODO(jdduke): Plumb tool type from the platform event, crbug.com/404128.
   DCHECK_LT(pointer_index, GetPointerCount());
   return TOOL_TYPE_UNKNOWN;
 }
 
 int MotionEventWeb::GetButtonState() const {
   return 0;
 }
 
 int MotionEventWeb::GetFlags() const {
   return WebEventModifiersToEventFlags(event_.modifiers);
 }
 
 }  // namespace content