[Mac] Fullscreen Touch Bar Support

chrome/browser/ui/cocoa/browser_window_touch_bar.h

 // Copyright 2017 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_BROWSER_WINDOW_TOUCH_BAR_H_
 #define CHROME_BROWSER_UI_COCOA_BROWSER_WINDOW_TOUCH_BAR_H_
 
 #import <Cocoa/Cocoa.h>
 
 #import "ui/base/cocoa/touch_bar_forward_declarations.h"
 
 class Browser;
 @class BrowserWindowController;
 
 // Provides a touch bar for the browser window. This class implements the
 // NSTouchBarDelegate and handles the items in the touch bar.
 @interface BrowserWindowTouchBar : NSObject<NSTouchBarDelegate>
 // True is the current page is loading. Used to determine if a stop or reload
 // button should be provided.
 @property(nonatomic, assign) BOOL isPageLoading;
 
 // True if the current page is starred. Used by star touch bar button.
 @property(nonatomic, assign) BOOL isStarred;
 
+// Returns a touch bar item identifier for the given |id|.
++ (NSString*)touchBarIdForItemId:(NSString*)id;
+
 // Designated initializer.
 - (instancetype)initWithBrowser:(Browser*)browser
         browserWindowController:(BrowserWindowController*)bwc;
 
 // Creates and returns a touch bar for the browser window.
 - (NSTouchBar*)makeTouchBar;
 
 @end
 
 #endif  // CHROME_BROWSER_UI_COCOA_BROWSER_WINDOW_TOUCH_BAR_H_