[MD Bookmarks] Add keyboard navigation to sidebar.

chrome/test/data/webui/BUILD.gn

 # 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.
 
 import("//chrome/common/features.gni")
 import("//chrome/test/base/js2gtest.gni")
 
 js2gtest("interactive_ui_tests_js_webui") {
   test_type = "webui"
 
   sources = [
     "cr_elements/cr_elements_focus_test.js",
+    "md_bookmarks/md_bookmarks_focus_test.js",
     "md_history/md_history_focus_test.js",
     "settings/cr_settings_interactive_ui_tests.js",
   ]
 
   gen_include_files = [
     "polymer_browser_test_base.js",
     "polymer_interactive_ui_test.js",
   ]
 
   deps = [
@@ skipping 164 matching lines @@
       "../../../browser/resources/chromeos/braille_ime/braille_ime_unittest.gtestjs",
       "../../../browser/resources/chromeos/select_to_speak/select_to_speak_unittest.gtestjs",
     ]
     extra_js_files += [
       "../../../browser/resources/chromeos/braille_ime/braille_ime.js",
       "../../../browser/resources/chromeos/select_to_speak/select_to_speak.js",
       "../../../browser/resources/chromeos/select_to_speak/test_support.js",
     ]
   }
 }