Implement a RenderFrame-less path for Web Notifications.

content/child/child_thread.cc

Index: content/child/child_thread.cc
diff --git a/content/child/child_thread.cc b/content/child/child_thread.cc
index 6bbc4a46edd3653951e7d3df529ee5aea1a9e0ad..da1f928dd353f0076a016af303fb2e2758e94496 100644
--- a/content/child/child_thread.cc
+++ b/content/child/child_thread.cc
@@ -35,6 +35,7 @@
 #include "content/child/fileapi/webfilesystem_impl.h"
 #include "content/child/geofencing/geofencing_message_filter.h"
 #include "content/child/mojo/mojo_application.h"
+#include "content/child/notifications/notification_dispatcher.h"
 #include "content/child/power_monitor_broadcast_source.h"
 #include "content/child/quota_dispatcher.h"
 #include "content/child/quota_message_filter.h"
@@ -289,14 +290,15 @@ void ChildThread::Init(const Options& options) {
       new QuotaMessageFilter(thread_safe_sender_.get());
   quota_dispatcher_.reset(new QuotaDispatcher(thread_safe_sender_.get(),
                                               quota_message_filter_.get()));
-
   geofencing_message_filter_ =
       new GeofencingMessageFilter(thread_safe_sender_.get());
-
+  notification_dispatcher_ =
+      new NotificationDispatcher(thread_safe_sender_.get());
   channel_->AddFilter(histogram_message_filter_.get());
   channel_->AddFilter(sync_message_filter_.get());
   channel_->AddFilter(resource_message_filter_.get());
   channel_->AddFilter(quota_message_filter_->GetFilter());
+  channel_->AddFilter(notification_dispatcher_->GetFilter());
   channel_->AddFilter(service_worker_message_filter_->GetFilter());
   channel_->AddFilter(geofencing_message_filter_->GetFilter());