[WIP] Implement notification sound loader

content/child/notifications/pending_notifications_tracker.h

Index: content/child/notifications/pending_notifications_tracker.h
diff --git a/content/child/notifications/pending_notifications_tracker.h b/content/child/notifications/pending_notifications_tracker.h
index 2d9d3b5b317652d364b6a5e67e44b75ba15facf6..b12819a3ac15654352c7e7b6e90bcaf50254797f 100644
--- a/content/child/notifications/pending_notifications_tracker.h
+++ b/content/child/notifications/pending_notifications_tracker.h
@@ -29,6 +29,7 @@ class WebSerializedOrigin;
 namespace content {
 
 class NotificationImageLoader;
+class NotificationSoundLoader;
 class NotificationManager;
 
 // Type definition for the callback signature which is to be invoked when the
@@ -69,23 +70,42 @@ class PendingNotificationsTracker {
  private:
   // To be called on the worker thread when the pending page notification
   // identified by |notification_id| has finished fetching the icon.
-  void DidFetchPageNotification(blink::WebNotificationDelegate* delegate,
+  void DidFetchPageNotificationIcon(blink::WebNotificationDelegate* delegate,
                                 int notification_id,
                                 const SkBitmap& icon);
 
+  // To be called on the worker thread when the pending page notification
+  // identified by |notification_id| has finished fetching the sound.
+  void DidFetchPageNotificationSound(blink::WebNotificationDelegate* delegate,
+                                int notification_id,
+                                const SkBitmap& sound);
+
   // To be called on the worker thread when the pending persistent notification
   // identified by |notification_id| has finished fetching the icon.
-  void DidFetchPersistentNotification(int notification_id,
+  void DidFetchPersistentNotificationIcon(int notification_id,
                                       const SkBitmap& icon);
 
-  // Common code for starting to fetch resources associated with any kind of
+  // To be called on the worker thread when the pending persistent notification
+  // identified by |notification_id| has finished fetching the sound.
+  void DidFetchPersistentNotificationSound(int notification_id,
+                                      const SkBitmap& sound);
+
+  // Common code for starting to fetch icon associated with any kind of
   // notification. Will return the id of the pending notification as allocated
   // in the |pending_notifications_| map.
-  int FetchNotificationResources(
+  int FetchNotificationIcon(
       const blink::WebNotificationData& notification_data,
       const NotificationResourcesFetchedCallback& callback,
       const scoped_refptr<NotificationImageLoader>& image_loader);
 
+  // Common code for starting to fetch sound associated with any kind of
+  // notification. Will return the id of the pending notification as allocated
+  // in the |pending_notifications_| map.
+  int FetchNotificationSound(
+      const blink::WebNotificationData& notification_data,
+      const NotificationResourcesFetchedCallback& callback,
+      const scoped_refptr<NotificationSoundLoader>& sound_loader);
+
   scoped_refptr<base::SingleThreadTaskRunner> main_thread_task_runner_;
 
   struct PendingNotification;