[Mac] Refactor Immersive Fullscreen Logic

chrome/browser/ui/cocoa/fullscreen/immersive_fullscreen_controller.h

+// Copyright 2016 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 CHROME_BROWSER_UI_COCOA_FULLSCREEN_IMMERSIVE_FULLSCREEN_CONTROLLER_H
+#define CHROME_BROWSER_UI_COCOA_FULLSCREEN_IMMERSIVE_FULLSCREEN_CONTROLLER_H
+
+#import <Cocoa/Cocoa.h>
+
+@class BrowserWindowController;
+
+// This class manages the menubar and dock visibility for Immersive Fullscreen.
+// It uses a tracking area to show/hide the menubar if the user interacts with
+// the top of the screen.
+@interface ImmersiveFullscreenController : NSObject
+
+// Designated initializer.
+- (instancetype)initWithBrowserController:(BrowserWindowController*)bwc;
+
+// Updates the menubar and dock visibility according the state of the
+// immersive fullscreen.
+- (void)updateMenuBarAndDockVisibility;
+
+// Returns YES if the menubar should be shown in immersive fullscreen for the
+// screen that contains the window.
+- (BOOL)shouldShowMenubar;
+
+@end
+
+#endif  // CHROME_BROWSER_UI_COCOA_FULLSCREEN_IMMERSIVE_FULLSCREEN_CONTROLLER_H