MD History: Add basic material design history cards and history items

chrome/browser/resources/history/externs.js

+// 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.
+
+/**
+ * @fileoverview Externs for objects sent from C++ to chrome://history.
+ * @externs
+ */
+
+/**
+ * The type of the history result object. The definition is based on
+ * chrome/browser/ui/webui/history_ui.cc:
+ *     BrowsingHistoryHandler::HistoryEntry::ToValue()
+ * @typedef {{allTimestamps: Array<number>,
+ *            blockedVisit: (boolean|undefined),
+ *            dateRelativeDay: (string|undefined),
+ *            dateShort: string,
+ *            dateTimeOfDay: (string|undefined),
+ *            deviceName: string,
+ *            deviceType: string,
+ *            domain: string,
+ *            hostFilteringBehavior: (number|undefined),
+ *            snippet: (string|undefined),

[Dan Beam, 2016/01/26 23:07:39]

can you just change the C++ so that these are more narrowly typed?

  number|undefined -> number, default: -1 (or some invalid number)
  string|undefined -> string, default: ''
  boolean|undefined -> boolean, default: false

observers in polymer wont work until all listed properties !== undefined, so if
you have:

  observers: ['fooChanged_(foo, bar, baz)'],

and this.foo is undefined, and bar/baz change, the observer will never fire

https://www.polymer-project.org/1.0/docs/devguide/properties.html#multi-prope...

[yingran, 2016/01/27 00:30:34]

Done.

+ *            starred: boolean,
+ *            time: number,
+ *            title: string,
+ *            url: string}}
+ */
+var HistoryEntry;
+
+/**
+ * The type of the history results info object. The definition is based on
+ * chrome/browser/ui/webui/history_ui.cc:
+ *     BrowsingHistoryHandler::QueryComplete()
+ * @typedef {{finished: boolean,
+ *            hasSyncedResults: (boolean|undefined),

[Dan Beam, 2016/01/26 23:07:39]

can this just always be a boolean?

[yingran, 2016/01/27 00:30:34]

Done.

+ *            queryEndTime: string,
+ *            queryStartTime: string,
+ *            term: string}}
+ */
+var HistoryQuery;