Protocol handlers should be able to register a service worker.

chrome/browser/chrome_content_browser_client.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_CHROME_CONTENT_BROWSER_CLIENT_H_
 #define CHROME_BROWSER_CHROME_CONTENT_BROWSER_CLIENT_H_
 
 #include <set>
 #include <string>
 #include <utility>
@@ skipping 74 matching lines @@
       content::BrowserContext* browser_context,
       content::ProtocolHandlerMap* protocol_handlers,
       content::URLRequestInterceptorScopedVector request_interceptors) override;
   net::URLRequestContextGetter* CreateRequestContextForStoragePartition(
       content::BrowserContext* browser_context,
       const base::FilePath& partition_path,
       bool in_memory,
       content::ProtocolHandlerMap* protocol_handlers,
       content::URLRequestInterceptorScopedVector request_interceptors) override;
   bool IsHandledURL(const GURL& url) override;
+  GURL GetHandlerFor(content::BrowserContext* browser_context,
+                     const GURL& url) override;
   bool CanCommitURL(content::RenderProcessHost* process_host,
                     const GURL& url) override;
   bool IsIllegalOrigin(content::ResourceContext* resource_context,
                        int child_process_id,
                        const GURL& origin) override;
   bool ShouldAllowOpenURL(content::SiteInstance* site_instance,
                           const GURL& url) override;
   bool IsSuitableHost(content::RenderProcessHost* process_host,
                       const GURL& site_url) override;
   bool MayReuseHost(content::RenderProcessHost* process_host) override;
@@ skipping 230 matching lines @@
   std::vector<ChromeContentBrowserClientParts*> extra_parts_;
 
   base::WeakPtrFactory<ChromeContentBrowserClient> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromeContentBrowserClient);
 };
 
 }  // namespace chrome
 
 #endif  // CHROME_BROWSER_CHROME_CONTENT_BROWSER_CLIENT_H_