Changes MouseEvent constructor to take changed_button_flags.

ui/events/event.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.h"
 
 #if defined(USE_X11)
 #include <X11/Xlib.h>
 #endif
 
@@ skipping 263 matching lines @@
     : LocatedEvent(native_event),
       changed_button_flags_(
           GetChangedMouseButtonFlagsFromNative(native_event)) {
   if (type() == ET_MOUSE_PRESSED || type() == ET_MOUSE_RELEASED)
     SetClickCount(GetRepeatCount(*this));
 }
 
 MouseEvent::MouseEvent(EventType type,
                        const gfx::Point& location,
                        const gfx::Point& root_location,
-                       int flags)
+                       int flags,
+                       int changed_button_flags)
     : LocatedEvent(type, location, root_location, EventTimeForNow(), flags),
-      changed_button_flags_(0) {
+      changed_button_flags_(changed_button_flags) {
   if (this->type() == ET_MOUSE_MOVED && IsAnyButton())
     SetType(ET_MOUSE_DRAGGED);
 }
 
 // static
 bool MouseEvent::IsRepeatedClickEvent(
     const MouseEvent& event1,
     const MouseEvent& event2) {
   // These values match the Windows defaults.
   static const int kDoubleClickTimeMS = 500;
@@ skipping 360 matching lines @@
 
 ScrollEvent::ScrollEvent(EventType type,
                          const gfx::Point& location,
                          base::TimeDelta time_stamp,
                          int flags,
                          float x_offset,
                          float y_offset,
                          float x_offset_ordinal,
                          float y_offset_ordinal,
                          int finger_count)
-    : MouseEvent(type, location, location, flags),
+    : MouseEvent(type, location, location, flags, 0),
       x_offset_(x_offset),
       y_offset_(y_offset),
       x_offset_ordinal_(x_offset_ordinal),
       y_offset_ordinal_(y_offset_ordinal),
       finger_count_(finger_count) {
   set_time_stamp(time_stamp);
   CHECK(IsScrollEvent());
 }
 
 void ScrollEvent::Scale(const float factor) {
@@ skipping 28 matching lines @@
 int GestureEvent::GetLowestTouchId() const {
   if (touch_ids_bitfield_ == 0)
     return -1;
   int i = -1;
   // Find the index of the least significant 1 bit
   while (!(1 << ++i & touch_ids_bitfield_));
   return i;
 }
 
 }  // namespace ui