Separate motion event touch geometry orientation from stylus orientation.

ui/events/gestures/motion_event_aura.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 "ui/events/gestures/motion_event_aura.h"
 
 #include <cmath>
@@ skipping 29 matching lines @@
     rotation_angle_rad -= static_cast<float>(M_PI_2);
     std::swap(radius_x, radius_y);
   }
 
   if (radius_x > radius_y) {
     // The case radius_x == radius_y 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.
     pointer_properties.touch_major = 2.f * radius_x;
     pointer_properties.touch_minor = 2.f * radius_y;
-    pointer_properties.orientation = rotation_angle_rad - M_PI_2;
+    pointer_properties.touch_orientation = rotation_angle_rad - M_PI_2;
   } else {
     pointer_properties.touch_major = 2.f * radius_y;
     pointer_properties.touch_minor = 2.f * radius_x;
-    pointer_properties.orientation = rotation_angle_rad;
+    pointer_properties.touch_orientation = rotation_angle_rad;
   }
 
   if (!pointer_properties.touch_major) {
     pointer_properties.touch_major =
         2.f * GestureConfiguration::GetInstance()->default_radius();
     pointer_properties.touch_minor =
         2.f * GestureConfiguration::GetInstance()->default_radius();
-    pointer_properties.orientation = 0;
+    pointer_properties.touch_orientation = 0;
   }
 
   // TODO(jdduke): Plumb tool type from the platform, crbug.com/404128.
   pointer_properties.tool_type = MotionEvent::TOOL_TYPE_UNKNOWN;
 
   return pointer_properties;
 }
 
 }  // namespace
 
@@ skipping 120 matching lines @@
 }
 
 int MotionEventAura::GetIndexFromId(int id) const {
   int index = FindPointerIndexOfId(id);
   DCHECK_GE(index, 0);
   DCHECK_LT(index, static_cast<int>(GetPointerCount()));
   return index;
 }
 
 }  // namespace ui