[Mac] Update the Text Color for the Avatar Button

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

Index: chrome/browser/ui/cocoa/profiles/avatar_button_controller.h
diff --git a/chrome/browser/ui/cocoa/profiles/avatar_button_controller.h b/chrome/browser/ui/cocoa/profiles/avatar_button_controller.h
index 51a349ef96a09115321daabaa41953c556b3aa34..062c1352c6cf01f509e0d2aaf3c0f60e8f6afd89 100644
--- a/chrome/browser/ui/cocoa/profiles/avatar_button_controller.h
+++ b/chrome/browser/ui/cocoa/profiles/avatar_button_controller.h
@@ -20,9 +20,16 @@ class Browser;
   // 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