Implement Material Design for Mac toolbar.

chrome/browser/ui/cocoa/toolbar/app_toolbar_button.h

+// Copyright 2016 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_TOOLBAR_APP_TOOLBAR_BUTTON_H_
+#define CHROME_BROWSER_UI_COCOA_TOOLBAR_APP_TOOLBAR_BUTTON_H_
+
+#import <Cocoa/Cocoa.h>
+
+#include "base/memory/scoped_ptr.h"
+#import "chrome/browser/ui/cocoa/menu_button.h"
+#include "chrome/browser/ui/toolbar/app_menu_icon_painter.h"
+
+class AppMenuButtonIconPainterDelegateMac;
+
+// Button for the app toolbar button.
+@interface AppToolbarButton : MenuButton {
+ @private
+  scoped_ptr<AppMenuButtonIconPainterDelegateMac> delegate_;
+  AppMenuIconPainter::Severity severity_;
+}
+
+- (void)setSeverity:(AppMenuIconPainter::Severity)severity
+      shouldAnimate:(BOOL)shouldAnimate;
+
+@end
+
+#endif  // CHROME_BROWSER_UI_COCOA_TOOLBAR_APP_TOOLBAR_BUTTON_H_