Update ui::PointerEvent to support mouse wheel and capture change events.

ui/events/event_constants.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_CONSTANTS_H_
 #define UI_EVENTS_EVENT_CONSTANTS_H_
 
 namespace ui {
 
 // Event types. (prefixed because of a conflict with windows headers)
@@ skipping 18 matching lines @@
   ET_TOUCH_CANCELLED,
   ET_DROP_TARGET_EVENT,
 
   // PointerEvent types
   ET_POINTER_DOWN,
   ET_POINTER_MOVED,
   ET_POINTER_UP,
   ET_POINTER_CANCELLED,
   ET_POINTER_ENTERED,
   ET_POINTER_EXITED,
+  ET_POINTER_WHEEL_CHANGED,
+  ET_POINTER_CAPTURE_CHANGED,
 
   // GestureEvent types
   ET_GESTURE_SCROLL_BEGIN,
   ET_GESTURE_TYPE_START = ET_GESTURE_SCROLL_BEGIN,
   ET_GESTURE_SCROLL_END,
   ET_GESTURE_SCROLL_UPDATE,
   ET_GESTURE_TAP,
   ET_GESTURE_TAP_DOWN,
   ET_GESTURE_TAP_CANCEL,
   ET_GESTURE_TAP_UNCONFIRMED,  // User tapped, but the tap delay hasn't expired.
@@ skipping 127 matching lines @@
 // Device type for gesture events.
 enum class GestureDeviceType : int {
   DEVICE_UNKNOWN = 0,
   DEVICE_TOUCHPAD,
   DEVICE_TOUCHSCREEN,
 };
 
 }  // namespace ui
 
 #endif  // UI_EVENTS_EVENT_CONSTANTS_H_