[MD Bookmarks] Support elision of bookmark names in the bookmark toast.

chrome/test/data/webui/load_time_data_browsertest.js

+// 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.
+
+/**
+ * @constructor
+ * @extends testing.Test
+ */
+function LoadTimeDataTest() {}
+
+LoadTimeDataTest.prototype = {
+  __proto__: testing.Test.prototype,
+
+  /** @override */
+  browsePreload: 'chrome://resources/html/load_time_data.html',
+};
+
+TEST_F('LoadTimeDataTest', 'getStringPieces', function() {
+  assertDeepEquals(
+      [{value: 'paper', arg: null}],
+      loadTimeData.getSubstitutedStringPieces('paper'));
+
+  assertDeepEquals(
+      [
+        {value: 'i think ', arg: null},
+        {value: 'paper mario', arg: '$1'},
+        {value: ' is a good game', arg: null},
+      ],
+      loadTimeData.getSubstitutedStringPieces(
+          'i think $1 is a good game', 'paper mario'));
+
+  assertDeepEquals(
+      [
+        {value: 'paper mario', arg: '$1'},
+        {value: ' costs $', arg: null},
+        {value: '60', arg: '$2'},
+      ],
+      loadTimeData.getSubstitutedStringPieces(
+          '$1 costs $$$2', 'paper mario', '60'));
+
+  assertDeepEquals(
+      [
+        {value: '$$', arg: null},
+        {value: '1', arg: '$1'},
+        {value: '2', arg: '$2'},
+        {value: '1', arg: '$1'},
+        {value: '$', arg: null},
+        {value: '2', arg: '$2'},
+        {value: '$', arg: null},
+        {value: '1', arg: '$1'},
+        {value: '$', arg: null},
+      ],
+      loadTimeData.getSubstitutedStringPieces(
+          '$$$$$1$2$1$$$2$$$1$$', '1', '2'));
+
+});