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 e1a5b856c208e151dfd1598d80c26c2c43d51414..969194e8a3ffb455936808fe231e465778ba7dd9 100644
--- a/content/child/child_thread.h
+++ b/content/child/child_thread.h
@@ -43,6 +43,7 @@ class ChildResourceMessageFilter;
 class ChildSharedBitmapManager;
 class FileSystemDispatcher;
 class GeofencingMessageFilter;
+class NotificationDispatcher;
 class ServiceWorkerMessageFilter;
 class QuotaDispatcher;
 class QuotaMessageFilter;
@@ -123,6 +124,10 @@ 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();
   }
@@ -243,6 +248,8 @@ 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_;