Revert of Don't handle NaturalScroll in Chrome but pass it to CMT instead

ui/events/event_utils.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_UTILS_H_
 #define UI_EVENTS_EVENT_UTILS_H_
 
 #include "base/event_types.h"
 #include "ui/events/event_constants.h"
 #include "ui/events/keycodes/keyboard_codes.h"
@@ skipping 105 matching lines @@
                                 float* x_offset,
                                 float* y_offset,
                                 float* x_offset_ordinal,
                                 float* y_offset_ordinal,
                                 int* finger_count);
 
 EVENTS_EXPORT bool GetGestureTimes(const base::NativeEvent& native_event,
                                double* start_time,
                                double* end_time);
 
+// Enable/disable natural scrolling for touchpads.
+EVENTS_EXPORT void SetNaturalScroll(bool enabled);
+
+// In natural scrolling enabled for touchpads?
+EVENTS_EXPORT bool IsNaturalScrollEnabled();
+
 // Returns whether natural scrolling should be used for touchpad.
 EVENTS_EXPORT bool ShouldDefaultToNaturalScroll();
 
 // Returns whether or not the internal display produces touch events.
 EVENTS_EXPORT gfx::Display::TouchSupport GetInternalDisplayTouchSupport();
 
 // Was this event generated by a touchpad device?
 // The caller is responsible for ensuring that this is a mouse/touchpad event
 // before calling this function.
 EVENTS_EXPORT bool IsTouchpadEvent(const base::NativeEvent& event);
@@ skipping 11 matching lines @@
 EVENTS_EXPORT uint16 GetScanCodeFromLParam(LPARAM lParam);
 EVENTS_EXPORT LPARAM GetLParamFromScanCode(uint16 scan_code);
 #endif
 
 // Registers a custom event type.
 EVENTS_EXPORT int RegisterCustomEventType();
 
 }  // namespace ui
 
 #endif  // UI_EVENTS_EVENT_UTILS_H_