MD Bookmarks: Implement basis for new data-binding system

chrome/browser/resources/md_bookmarks/types.js

Index: chrome/browser/resources/md_bookmarks/types.js
diff --git a/chrome/browser/resources/md_bookmarks/types.js b/chrome/browser/resources/md_bookmarks/types.js
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+++ b/chrome/browser/resources/md_bookmarks/types.js
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+// Copyright 2017 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.
+
+/**
+ * @fileoverview Closure typedefs for MD Bookmarks.
+ */
+
+/** @typedef {!Object} */
+var BookmarksPageState;
+
+/** @typedef {{name: string}} */
+var Action;
+
+/** @interface */
+function StoreObserver(){};
+
+/** @param {!BookmarksPageState} newState */
+StoreObserver.prototype.onStateChanged = function(newState) {};