html_viewer: Add a mock WebNotificationManager.

mojo/services/html_viewer/BUILD.gn

 # Copyright 2014 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("//testing/test.gni")
 import("//third_party/mojo/src/mojo/public/mojo.gni")
 import("//third_party/mojo/src/mojo/public/mojo_application.gni")
 import("//tools/grit/repack.gni")
 
 # Repack this here.
@@ skipping 58 matching lines @@
     "webclipboard_impl.cc",
     "webclipboard_impl.h",
     "webcookiejar_impl.cc",
     "webcookiejar_impl.h",
     "weblayertreeview_impl.cc",
     "weblayertreeview_impl.h",
     "webmediaplayer_factory.cc",
     "webmediaplayer_factory.h",
     "webmimeregistry_impl.cc",
     "webmimeregistry_impl.h",
+    "webnotificationmanager_impl.cc",
+    "webnotificationmanager_impl.h",
     "webscheduler_impl.cc",
     "webscheduler_impl.h",
     "websockethandle_impl.cc",
     "websockethandle_impl.h",
     "webstoragenamespace_impl.cc",
     "webstoragenamespace_impl.h",
     "webthemeengine_impl.cc",
     "webthemeengine_impl.h",
     "webthread_impl.cc",
     "webthread_impl.h",
@@ skipping 144 matching lines @@
 
   # TODO(msw): Move this to mojo/application:test_support; see crbug.com/477104.
   data_deps = []
   if (is_android) {
     data_deps += [ "//mojo/android" ]
   }
   if (!is_component_build) {
     data_deps += [ "//mojo/shell:mojo_shell" ]
   }
 }