Bring up fast user switcher on right-click of the avatar menu on Mac.

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
new file mode 100644
index 0000000000000000000000000000000000000000..444110d5c23aba0d8034864e5b78bc701267e4ab
--- /dev/null
+++ b/chrome/browser/ui/cocoa/profiles/avatar_button.h
@@ -0,0 +1,23 @@
+// Copyright 2015 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_H_
+#define CHROME_BROWSER_UI_COCOA_PROFILES_AVATAR_BUTTON_H_
+
+#import <Cocoa/Cocoa.h>
+
+#import "ui/base/cocoa/hover_image_button.h"
+
+// A subclass of HoverImageButton that sends a target-action on right click.
+@interface AvatarButton : HoverImageButton {
+ @private
+  SEL rightAction_;
+}
+
+// Sets the action that will be called when this button is right clicked.
+- (void)setRightAction:(SEL)selector;
+
+@end
+
+#endif //CHROME_BROWSER_UI_COCOA_PROFILES_AVATAR_BUTTON_H_