[Mac] Touch Bar support for default browser window state

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;
+
+// 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;
+
+// Designated initializer.
+- (instancetype)initWithBrowser:(Browser*)browser;
+
+// Creates and returns a touch bar for the browser window.
+- (NSTouchBar*)makeTouchBar;
+
+@end
+
+#endif  // CHROME_BROWSER_UI_COCOA_BROWSER_WINDOW_TOUCH_BAR_H_