[Mac] Enable MacViews bookmark bubble behind --enable-mac-views-dialogs.

chrome/browser/ui/bookmarks/bookmark_bubble_observer.h

+// Copyright 2012 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_BOOKMARKS_BOOKMARK_BUBBLE_OBSERVER_H_
+#define CHROME_BROWSER_UI_BOOKMARKS_BOOKMARK_BUBBLE_OBSERVER_H_
+
+class GURL;
+
+namespace bookmarks {
+
+class BookmarkBubbleObserver {
+ public:
+  virtual ~BookmarkBubbleObserver() {}
+
+  virtual void OnBookmarkBubbleShown(const GURL& url) = 0;
+  virtual void OnBookmarkBubbleHidden() = 0;
+};
+
+}  // namespace bookmarks
+
+#endif  // CHROME_BROWSER_UI_BOOKMARKS_BOOKMARK_BUBBLE_OBSERVER_H_