Request the icon of a Web Notification in the renderer process.

content/renderer/notification_provider.h

Index: content/renderer/notification_provider.h
diff --git a/content/renderer/notification_provider.h b/content/renderer/notification_provider.h
index ab49b073cfbf5ab4a6bb57d19d31bf0942fd7065..6ff0b75e736e24ad9568dedb650a74b7b3fb8f32 100644
--- a/content/renderer/notification_provider.h
+++ b/content/renderer/notification_provider.h
@@ -5,11 +5,14 @@
 #ifndef CONTENT_RENDERER_NOTIFICATION_PROVIDER_H_
 #define CONTENT_RENDERER_NOTIFICATION_PROVIDER_H_
 
+#include "base/memory/scoped_vector.h"
 #include "content/public/renderer/render_frame_observer.h"
 #include "content/renderer/active_notification_tracker.h"
 #include "third_party/WebKit/public/web/WebNotification.h"
 #include "third_party/WebKit/public/web/WebNotificationPresenter.h"
 
+class SkBitmap;
+
 namespace content {
 
 // NotificationProvider class is owned by the RenderFrame.  Only to be used on
@@ -24,13 +27,20 @@ class NotificationProvider : public RenderFrameObserver,
   // RenderFrameObserver implementation.
   virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
 
-  // blink::WebNotificationPresenter interface.
+  // blink::WebNotificationPresenter implementation.
   virtual bool show(const blink::WebNotification& proxy);
   virtual void cancel(const blink::WebNotification& proxy);
   virtual void objectDestroyed(const blink::WebNotification& proxy);
   virtual blink::WebNotificationPresenter::Permission checkPermission(
       const blink::WebSecurityOrigin& origin);
 
+  // Sends an IPC to the browser process to display |notification|
+  // accompanied by the downloaded icon.
+  void DisplayNotification(const blink::WebNotification& notification,
+                           const SkBitmap& icon);
+
+  void CancelIconDownload(const blink::WebNotification& notification);
+
   // IPC handlers.
   void OnDisplay(int id);
   void OnError(int id);
@@ -38,6 +48,12 @@ class NotificationProvider : public RenderFrameObserver,
   void OnClick(int id);
   void OnNavigate();
 
+  class IconDownloader;
+
+  // A vector tracking notifications which' icon is still being downloaded.
+  typedef ScopedVector<IconDownloader> PendingNotifications;
+  PendingNotifications pending_notifications_;
+
   // A tracker object which manages the active notifications and the IDs
   // that are used to refer to them over IPC.
   ActiveNotificationTracker manager_;