MD History: Add lazy-render element for simple lazy initialization.

chrome/browser/resources/md_history/externs.js

Index: chrome/browser/resources/md_history/externs.js
diff --git a/chrome/browser/resources/md_history/externs.js b/chrome/browser/resources/md_history/externs.js
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+// 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.
+
+/**
+ * @fileoverview Externs required to closure-compile MD History.
+ * @externs
+ */
+
+// Types:
+/**
+ * @typedef {{groupedOffset: number,
+ *            incremental: boolean,
+ *            querying: boolean,
+ *            range: HistoryRange,
+ *            searchTerm: string}}
+ */
+var QueryState;
+
+/**
+ * @typedef {{info: ?HistoryQuery,
+ *            results: ?Array<!HistoryEntry>,
+ *            sessionList: ?Array<!ForeignSession>}}
+ */
+var QueryResult;
+
+/**
+ * @constructor
+ * @extends {MouseEvent}
+ */
+var DomRepeatClickEvent = function() {};
+
+/** @type {Object} */
+DomRepeatClickEvent.prototype.model;
+
+/**
+ * A template instance created by Polymer.Templatizer.
+ * @constructor
+ * @extends {PolymerElement}
+ */
+var TemplateInstance = function() {};
+
+/** @type {Array<Element>} */
+TemplateInstance.prototype._children;
+
+/**
+ * @param {string} prop
+ * @param {Object} value
+ * @param {boolean} quiet
+ */
+TemplateInstance.prototype.__setProperty = function(prop, value, quiet) {};
+
+/**
+ * @param {string} path
+ * @param {Object} value
+ * @param {boolean} quiet
+ */
+TemplateInstance.prototype._notifyPath = function(path, value, quiet) {};