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

content/renderer/notification_provider.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #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
 // the main thread.
 class NotificationProvider : public RenderFrameObserver,
                              public blink::WebNotificationPresenter {
  public:
   explicit NotificationProvider(RenderFrame* render_frame);
   virtual ~NotificationProvider();
 
  private:
   // 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 RemovePendingNotification(const blink::WebNotification& notification);
+
   // IPC handlers.
   void OnDisplay(int id);
   void OnError(int id);
   void OnClose(int id, bool by_user);
   void OnClick(int id);
   void OnNavigate();
 
+  class IconDownloader;
+
+  // A vector tracking notifications which' icon is still being downloaded.

[Mike West, 2014/09/18 19:48:43]

Nit: Stray '. Perhaps "Vector containing notification whose icons are not yet
downloaded."

[Peter Beverloo, 2014/09/19 14:15:48]

It's not stray, it indicates ownership and doesn't include the "s" because
pronouncing the word ends with an s-like tone.

I do prefer "whose". Changed :-).

+  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_;
 
   DISALLOW_COPY_AND_ASSIGN(NotificationProvider);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_NOTIFICATION_PROVIDER_H_