[Material][Mac] Fix tabstrip and avatar button hierarchy

chrome/browser/ui/cocoa/tabs/tab_window_controller.h

 // Copyright (c) 2012 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_TABS_TAB_WINDOW_CONTROLLER_H_
 #define CHROME_BROWSER_UI_COCOA_TABS_TAB_WINDOW_CONTROLLER_H_
 
 // A class acting as the Objective-C window controller for a window that has
 // tabs which can be dragged around. Tabs can be re-arranged within the same
 // window or dragged into other TabWindowController windows. This class doesn't
@@ skipping 141 matching lines @@
 // if it does, NO otherwise). The default implementation returns YES.
 - (BOOL)hasTabStrip;
 
 // Gets whether a particular tab is draggable between windows.
 - (BOOL)isTabDraggable:(NSView*)tabView;
 
 // In any fullscreen mode, the y offset to use for the content at the top of
 // the screen (tab strip, omnibox, bookmark bar, etc). Ranges from 0 to -22.
 - (CGFloat)menubarOffset;
 
+// Returns the view of the avatar button.
+- (NSView*)avatarView;
+
 // Tell the window that it needs to call performClose: as soon as the current
 // drag is complete. This prevents a window (and its overlay) from going away
 // during a drag.
 - (void)deferPerformClose;
 
 @end
 
 @interface TabWindowController(ProtectedMethods)
 // Tells the tab strip to forget about this tab in preparation for it being
 // put into a different tab strip, such as during a drop on another window.
 - (void)detachTabView:(NSView*)view;
 
 // Called when the size of the window content area has changed. Override to
 // position specific views. Base class implementation does nothing.
 - (void)layoutSubviews;
 @end
 
 #endif  // CHROME_BROWSER_UI_COCOA_TABS_TAB_WINDOW_CONTROLLER_H_