[Mac] Refactor the fullscreen menubar

ui/base/cocoa/appkit_utils.h

 // Copyright 2013 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_BASE_COCOA_APPKIT_UTILS_H
 #define UI_BASE_COCOA_APPKIT_UTILS_H
 
 #import <Cocoa/Cocoa.h>
 
 #include "ui/base/ui_base_export.h"
@@ skipping 27 matching lines @@
 // Minimizes or zooms the window, or does nothing, depending on OS version and
 // system configuration.
 // |window| is the receiver of the double click.
 // |sender| is the object that sends the action, if one is sent.
 UI_BASE_EXPORT void WindowTitlebarReceivedDoubleClick(NSWindow* window,
                                                       id sender);
 
 // Whether a force-click event on the touchpad should invoke Quick Look.
 UI_BASE_EXPORT bool ForceClickInvokesQuickLook();
 
+// Returns true if both CGFloat values are equal.
+UI_BASE_EXPORT bool IsCGFloatEqual(CGFloat a, CGFloat b);
+
 }  // namespace ui
 
 #endif  // UI_BASE_COCOA_APPKIT_UTILS_H