MD Bookmarks: Integrate new data store with UI elements

chrome/test/data/webui/md_bookmarks/test_store.js

+// 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.
+
+cr.define('bookmarks', function() {
+  var TestStore = function(data) {
+    this.data = Object.assign(bookmarks.util.createEmptyState(), data);
+    this.actions_ = [];
+    this.observers_ = [];
+  };
+
+  TestStore.prototype = {
+    addObserver: function(client) {
+      this.observers_.push(client);
+    },
+
+    removeObserver: function(client) {},
+
+    isInitialized: function() {
+      return true;
+    },
+
+    handleAction: function(action) {
+      this.actions_.push(action);

[calamity, 2017/03/09 04:58:57]

Is this stack for multi-action UI interactions?

[tsergeant, 2017/03/09 06:27:55]

That's the idea. Nothing ended up needing it, though, so I'll remove it.

+    },
+
+    get lastAction() {
+      return this.actions_[this.actions_.length - 1];
+    },
+
+    notifyObservers: function() {
+      // For simplicity, we don't want tests to have to worry about modifying
+      // the whole state tree when they want to change a single property. An
+      // alternative is to perform a deep clone in here.
+      this.observers_.forEach((client) => client.onStateChanged(this.data));

[calamity, 2017/03/09 04:58:57]

This might want to explain why a deep copy may be necessary.

[tsergeant, 2017/03/09 06:27:55]

Reworded as a TODO. WDYT?

[calamity, 2017/03/10 03:34:21]

Sounds good.

+    },
+  };
+
+  return {
+    TestStore: TestStore,
+  };
+});