MD Settings: Add import data dialog.

chrome/browser/resources/settings/people_page/import_data_dialog.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.
+
+/**
+ * @fileoverview 'settings-import-data-dialog' is a component for importing
+ * bookmarks and other data from other sources.
+ */
+Polymer({
+  is: 'settings-import-data-dialog',
+
+  behaviors: [I18nBehavior, WebUIListenerBehavior],
+
+  properties: {
+    /** @private {!Array<!settings.BrowserProfile>} */
+    browserProfiles_: Array,
+
+    /** @private {!settings.BrowserProfile} */
+    selected_: Object,
+
+    prefs: Object,
+  },
+
+  /** @private {?settings.ImportDataBrowserProxy} */
+  browserProxy_: null,
+
+  /** @override */
+  attached: function() {
+    this.browserProxy_ = settings.ImportDataBrowserProxyImpl.getInstance();
+    this.browserProxy_.initializeImportDialog().then(function(data) {
+      this.browserProfiles_ = data;
+      this.selected_ = this.browserProfiles_[0];
+    }.bind(this));
+
+    this.addWebUIListener('import-data-status-changed', function(e) {
+      // TODO(dpapad): Handle events to show spinner or success message.
+    });
+
+    this.$.dialog.showModal();
+  },
+
+  /** @private */
+  isImportFromFileSelected_: function() {
+    // The last entry in |browserProfiles_| always refers to dummy profile for
+    // importing from a bookmarks file.
+    return this.selected_.index == this.browserProfiles_.length - 1;
+  },
+
+  /**
+   * @return {string}
+   * @private
+   */
+  getActionButtonText_: function() {
+    return this.i18n(this.isImportFromFileSelected_() ?
+        'importChooseFile' : 'importCommit');
+  },
+
+  /** @private */
+  onChange_: function() {
+    this.selected_ = this.browserProfiles_[this.$.browserSelect.selectedIndex];
+  },
+
+  /** @private */
+  onActionButtonTap_: function() {
+    if (this.isImportFromFileSelected_()) {
+      this.browserProxy_.importFromBookmarksFile();
+    } else {
+      // TODO(dpapad): Implement this.
+    }
+  },
+
+  /** @private */
+  onCancelTap_: function() {
+    this.$.dialog.close();
+  },
+});