Protocol handlers should be able to register a service worker.

content/public/browser/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 CONTENT_PUBLIC_BROWSER_CONTENT_BROWSER_CLIENT_H_
 #define CONTENT_PUBLIC_BROWSER_CONTENT_BROWSER_CLIENT_H_
 
 #include <map>
 #include <string>
 #include <utility>
@@ skipping 202 matching lines @@
   virtual net::URLRequestContextGetter* CreateRequestContextForStoragePartition(
       BrowserContext* browser_context,
       const base::FilePath& partition_path,
       bool in_memory,
       ProtocolHandlerMap* protocol_handlers,
       URLRequestInterceptorScopedVector request_interceptors);
 
   // Returns whether a specified URL is handled by the embedder's internal
   // protocol handlers.
   virtual bool IsHandledURL(const GURL& url);
+  virtual GURL GetHandlerFor(BrowserContext* browser_context, const GURL& url);
 
   // Returns whether the given process is allowed to commit |url|.  This is a
   // more conservative check than IsSuitableHost, since it is used after a
   // navigation has committed to ensure that the process did not exceed its
   // authority.
   // This is called on the UI thread.
   virtual bool CanCommitURL(RenderProcessHost* process_host, const GURL& url);
 
   // Returns true if no URL within |origin| is allowed to commit in the given
   // process.  Must return false if there exists at least one URL in |origin|
@@ skipping 470 matching lines @@
   // Allows an embedder to provide its own ExternalVideoSurfaceContainer
   // implementation.  Return nullptr to disable external surface video.
   virtual ExternalVideoSurfaceContainer*
   OverrideCreateExternalVideoSurfaceContainer(WebContents* web_contents);
 #endif
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_CONTENT_BROWSER_CLIENT_H_