Split cocoa_event_utils in two parts.

ui/events/cocoa/cocoa_event_utils.h

+// Copyright 2014 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_COCOA_COCOA_EVENT_UTILS_H_
+#define UI_EVENTS_COCOA_COCOA_EVENT_UTILS_H_
+
+#import <Cocoa/Cocoa.h>
+
+#include "ui/events/events_export.h"
+
+namespace ui {
+
+// Converts the Cocoa |modifiers| bitsum into a ui::EventFlags bitsum.
+EVENTS_EXPORT int EventFlagsFromModifiers(NSUInteger modifiers);
+
+// Retrieves a bitsum of ui::EventFlags represented by |event|,
+// but instead use the modifier flags given by |modifiers|,
+// which is the same format as |-NSEvent modifierFlags|. This allows
+// substitution of the modifiers without having to create a new event from
+// scratch.
+EVENTS_EXPORT int EventFlagsFromNSEventWithModifiers(NSEvent* event,
+                                                     NSUInteger modifiers);
+}  // namespace ui
+
+#endif  // UI_EVENTS_COCOA_COCOA_EVENT_UTILS_H_