Implement a RenderFrame-less path for Web Notifications.

content/child/child_thread.h

Index: content/child/child_thread.h
diff --git a/content/child/child_thread.h b/content/child/child_thread.h
index c718000cfe57ffd1ac37c9bc82999ea00958d348..313cfffb75a408ef32c730268e07c2a8a0e04e3c 100644
--- a/content/child/child_thread.h
+++ b/content/child/child_thread.h
@@ -42,6 +42,7 @@ class ChildResourceMessageFilter;
 class ChildSharedBitmapManager;
 class FileSystemDispatcher;
 class GeofencingMessageFilter;
+class NotificationDispatcher;
 class ServiceWorkerMessageFilter;
 class QuotaDispatcher;
 class QuotaMessageFilter;
@@ -122,6 +123,10 @@ class CONTENT_EXPORT ChildThread : public IPC::Listener, public IPC::Sender {
     return quota_dispatcher_.get();
   }
 
+  NotificationDispatcher* notification_dispatcher() const {
+    return notification_dispatcher_.get();
+  }
+
   IPC::SyncMessageFilter* sync_message_filter() const {
     return sync_message_filter_.get();
   }
@@ -245,6 +250,8 @@ class CONTENT_EXPORT ChildThread : public IPC::Listener, public IPC::Sender {
 
   scoped_refptr<QuotaMessageFilter> quota_message_filter_;
 
+  scoped_refptr<NotificationDispatcher> notification_dispatcher_;
+
   scoped_ptr<ChildSharedBitmapManager> shared_bitmap_manager_;
 
   scoped_ptr<ChildGpuMemoryBufferManager> gpu_memory_buffer_manager_;