Handle alternate types in HandleMouseEvent.

ui/base/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/base/events/event.h"
 
 #if defined(USE_X11)
 #include <X11/Xlib.h>
 #endif
 
@@ skipping 401 matching lines @@
   SetType(ET_MOUSEWHEEL);
 }
 
 MouseWheelEvent::MouseWheelEvent(const MouseEvent& mouse_event,
                                  int x_offset,
                                  int y_offset)
     : MouseEvent(mouse_event), offset_(x_offset, y_offset) {
   DCHECK(type() == ET_MOUSEWHEEL);
 }
 
+MouseWheelEvent::MouseWheelEvent(const MouseWheelEvent& mouse_wheel_event)
+    : MouseEvent(mouse_wheel_event),
+      offset_(mouse_wheel_event.offset()) {
+  DCHECK(type() == ET_MOUSEWHEEL);
+}
+
 #if defined(OS_WIN)
 // This value matches windows WHEEL_DELTA.
 // static
 const int MouseWheelEvent::kWheelDelta = 120;
 #else
 // This value matches GTK+ wheel scroll amount.
 const int MouseWheelEvent::kWheelDelta = 53;
 #endif
 
+void MouseWheelEvent::UpdateForRootTransform(
+    const gfx::Transform& inverted_root_transform) {
+  LocatedEvent::UpdateForRootTransform(inverted_root_transform);
+  gfx::DecomposedTransform decomp;
+  bool success = gfx::DecomposeTransform(&decomp, inverted_root_transform);
+  DCHECK(success);
+  if (decomp.scale[0])
+    offset_.set_x(offset_.x() * decomp.scale[0]);
+  if (decomp.scale[1])
+    offset_.set_y(offset_.y() * decomp.scale[1]);
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 // TouchEvent
 
 TouchEvent::TouchEvent(const base::NativeEvent& native_event)
     : LocatedEvent(native_event),
       touch_id_(GetTouchId(native_event)),
       radius_x_(GetTouchRadiusX(native_event)),
       radius_y_(GetTouchRadiusY(native_event)),
       rotation_angle_(GetTouchAngle(native_event)),
       force_(GetTouchForce(native_event)) {
@@ skipping 308 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