[Mac] Implement an active state for the avatar button

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

Index: chrome/browser/ui/cocoa/profiles/avatar_button.h
diff --git a/chrome/browser/ui/cocoa/profiles/avatar_button.h b/chrome/browser/ui/cocoa/profiles/avatar_button.h
index 444110d5c23aba0d8034864e5b78bc701267e4ab..f6ab93acc41181517854467d0ee8aa8050ae445e 100644
--- a/chrome/browser/ui/cocoa/profiles/avatar_button.h
+++ b/chrome/browser/ui/cocoa/profiles/avatar_button.h
@@ -9,12 +9,17 @@
 
 #import "ui/base/cocoa/hover_image_button.h"
 
-// A subclass of HoverImageButton that sends a target-action on right click.
+// A subclass of HoverImageButton that sends a target-action on right click and
+// has an active state.
 @interface AvatarButton : HoverImageButton {
  @private
   SEL rightAction_;
 }
 
+// YES if the button is active. The button should only be active when the
+// avatar bubble is shown.
+@property(nonatomic, assign) BOOL isActive;
+
 // Sets the action that will be called when this button is right clicked.
 - (void)setRightAction:(SEL)selector;