Add support for new scroll valuators coming from CMT

ui/views/events/event_aura.cc

 // Copyright (c) 2011 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/views/events/event.h"
 
 #include "base/logging.h"
 #include "ui/aura/event.h"
 #include "ui/base/keycodes/keyboard_code_conversion.h"
 
@@ skipping 41 matching lines @@
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // MouseWheelEvent, public:
 
 MouseWheelEvent::MouseWheelEvent(const NativeEvent& native_event)
     : MouseEvent(native_event),
       offset_(ui::GetMouseWheelOffset(native_event->native_event())) {
 }
 
+ScrollEvent::ScrollEvent(const NativeEvent& native_event)
+    : MouseEvent(native_event) {
+  CHECK(ui::GetScrollOffsets(
+      native_event->native_event(), &x_offset_, &y_offset_));
+}
+
 }  // namespace views