[Mac] Update the Text Color for the Avatar Button

chrome/browser/ui/cocoa/profiles/avatar_button_controller.h

 // Copyright 2014 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_PROFILES_AVATAR_BUTTON_CONTROLLER_H_
 #define CHROME_BROWSER_UI_COCOA_PROFILES_AVATAR_BUTTON_CONTROLLER_H_
 
 #import <AppKit/AppKit.h>
 
 #import "chrome/browser/ui/cocoa/profiles/avatar_base_controller.h"
 
 class Browser;
 
 // This view controller manages the button that sits in the top of the
 // window frame when using multi-profiles, and shows the current profile's
 // name. Clicking the button will open the profile menu.
 @interface AvatarButtonController : AvatarBaseController {
  @private
   BOOL isThemedWindow_;
   // Whether the signed in profile has an authentication error. Used to
   // display an error icon next to the button text.
   BOOL hasError_;
+
+  // The window associated with the avatar button. Weak.
+  NSWindow* window_;
 }
-// Designated initializer.
-- (id)initWithBrowser:(Browser*)browser;
+// Designated initializer. The parameter |window| is required because
+// browser->window() might be null when the initalizer is called.
+- (id)initWithBrowser:(Browser*)browser window:(NSWindow*)window;
+
+// Returns YES if the browser window's frame color is dark.
+- (BOOL)isFrameColorDark;
 
 // Overridden so that we can change the active state of the avatar button.
 - (void)showAvatarBubbleAnchoredAt:(NSView*)anchor
                           withMode:(BrowserWindow::AvatarBubbleMode)mode
                    withServiceType:(signin::GAIAServiceType)serviceType
                    fromAccessPoint:(signin_metrics::AccessPoint)accessPoint;
 - (void)bubbleWillClose:(NSNotification*)notif;
 
 @end
 
 #endif  // CHROME_BROWSER_UI_COCOA_PROFILES_AVATAR_BUTTON_CONTROLLER_H_