Register a Service Worker when an extension is enabled.

chrome/browser/extensions/extension_host.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 CHROME_BROWSER_EXTENSIONS_EXTENSION_HOST_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_HOST_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 52 matching lines @@
 
   ViewType extension_host_type() const { return extension_host_type_; }
   const GURL& GetURL() const;
 
   // Returns true if the render view is initialized and didn't crash.
   bool IsRenderViewLive() const;
 
   // Prepares to initializes our RenderViewHost by creating its RenderView and
   // navigating to this host's url. Uses host_view for the RenderViewHost's view
   // (can be NULL). This happens delayed to avoid locking the UI.
-  void CreateRenderViewSoon();
+  void CreateRenderViewSoon(const base::Closure& continuation);
 
   // content::WebContentsObserver
   virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
   virtual void RenderViewCreated(
       content::RenderViewHost* render_view_host) OVERRIDE;
   virtual void RenderViewDeleted(
       content::RenderViewHost* render_view_host) OVERRIDE;
   virtual void RenderViewReady() OVERRIDE;
   virtual void RenderProcessGone(base::TerminationStatus status) OVERRIDE;
   virtual void DocumentAvailableInMainFrame() OVERRIDE;
@@ skipping 86 matching lines @@
   content::NotificationRegistrar registrar_;
 
   ExtensionFunctionDispatcher extension_function_dispatcher_;
 
   // The type of view being hosted.
   ViewType extension_host_type_;
 
   // Used to measure how long it's been since the host was created.
   base::ElapsedTimer since_created_;
 
+  // Called when the RenderView is created.
+  std::vector<base::Closure> when_render_view_created_;
+
   DISALLOW_COPY_AND_ASSIGN(ExtensionHost);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_HOST_H_