ui/events: Add changed_button_flags_ in ui::PointerEvent.

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 <stdint.h>
 
 #include <memory>
@@ skipping 709 matching lines @@
 
   PointerEvent(const PointerEvent& pointer_event);
   explicit PointerEvent(const MouseEvent& mouse_event);
   explicit PointerEvent(const TouchEvent& touch_event);
 
   PointerEvent(EventType type,
                const gfx::Point& location,
                const gfx::Point& root_location,
                int flags,
                int pointer_id,
+               int changed_button_flags,
                const PointerDetails& pointer_details,
                base::TimeTicks time_stamp);
 
   int32_t pointer_id() const { return pointer_id_; }
+  int changed_button_flags() const { return changed_button_flags_; }
+  void set_changed_button_flags(int flags) { changed_button_flags_ = flags; }
   const PointerDetails& pointer_details() const { return details_; }
 
  private:
   int32_t pointer_id_;
+  int changed_button_flags_;
   PointerDetails details_;
 };
 
 // A KeyEvent is really two distinct classes, melded together due to the
 // DOM legacy of Windows key events: a keystroke event (is_char_ == false),
 // or a character event (is_char_ == true).
 //
 // For a keystroke event,
 // -- |bool is_char_| is false.
 // -- |EventType Event::type()| can be ET_KEY_PRESSED or ET_KEY_RELEASED.
@@ skipping 254 matching lines @@
   // dispatched. This field gets a non-zero value only for gestures that are
   // released through TouchDispositionGestureFilter::SendGesture. The gesture
   // events that aren't fired directly in response to processing a touch-event
   // (e.g. timer fired ones), this id is zero. See crbug.com/618738.
   uint32_t unique_touch_event_id_;
 };
 
 }  // namespace ui
 
 #endif  // UI_EVENTS_EVENT_H_