Add support for new scroll valuators coming from CMT

ui/views/events/event.h

 // 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.
 
 #ifndef UI_VIEWS_EVENTS_EVENT_H_
 #define UI_VIEWS_EVENTS_EVENT_H_
 #pragma once
 
 #include "base/basictypes.h"
 #include "base/time.h"
@@ skipping 392 matching lines @@
  private:
   // Data associated with the drag/drop session.
   const ui::OSExchangeData& data_;
 
   // Bitmask of supported ui::DragDropTypes::DragOperation by the source.
   int source_operations_;
 
   DISALLOW_COPY_AND_ASSIGN(DropTargetEvent);
 };
 
+class VIEWS_EXPORT ScrollEvent : public MouseEvent {
+ public:
+  explicit ScrollEvent(const NativeEvent& native_event);
+  float x_offset() const { return x_offset_; }
+  float y_offset() const { return y_offset_; }
+
+ private:
+  float x_offset_;
+  float y_offset_;
+
+  DISALLOW_COPY_AND_ASSIGN(ScrollEvent);
+};
+
 }  // namespace views
 
 #endif  // UI_VIEWS_EVENTS_EVENT_H_