Implement the ability to get all notifications in Chromium.

content/browser/notifications/notification_message_filter.h

Index: content/browser/notifications/notification_message_filter.h
diff --git a/content/browser/notifications/notification_message_filter.h b/content/browser/notifications/notification_message_filter.h
index 8f400a681fb1601108dd52267d507e720e246a70..7dcbcbddc702d477df8cb22653ef5f093c4f7b32 100644
--- a/content/browser/notifications/notification_message_filter.h
+++ b/content/browser/notifications/notification_message_filter.h
@@ -11,6 +11,7 @@
 #include "base/memory/weak_ptr.h"
 #include "content/common/content_export.h"
 #include "content/public/browser/browser_message_filter.h"
+#include "content/public/browser/notification_database_data.h"
 #include "third_party/WebKit/public/platform/modules/notifications/WebNotificationPermission.h"
 
 class GURL;
@@ -81,6 +82,16 @@ class CONTENT_EXPORT NotificationMessageFilter : public BrowserMessageFilter {
       bool success,
       int64_t notification_id);
 
+  // Callback to be invoked when all notifications belonging to a Service Worker
+  // registration have been read from the database. The |success| argument
+  // indicates whether the data could be read successfully, whereas the actual
+  // notifications will be stored in |notifications|.
+  void DidGetNotifications(
+      int request_id,
+      const std::string& filter_tag,
+      bool success,
+      const std::vector<NotificationDatabaseData>& notifications);
+
   // Callback to be invoked when the data associated with a persistent
   // notification has been removed by the database, unless an error occurred,
   // which will be indicated by |success|.