[Extension ServiceWorkers] Allow service worker registration

content/public/common/content_client.h

Index: content/public/common/content_client.h
diff --git a/content/public/common/content_client.h b/content/public/common/content_client.h
index 9b9cebac720c5ff42fb525d284523ce238dbc429..89887e054c2e032a623eb7801584a63401e13d5b 100644
--- a/content/public/common/content_client.h
+++ b/content/public/common/content_client.h
@@ -141,6 +141,11 @@ class CONTENT_EXPORT ContentClient {
   virtual void AddSecureSchemesAndOrigins(std::set<std::string>* schemes,
                                           std::set<GURL>* origins) {}
 
+  // Gives the embedder a chance to register additional schemes that
+  // should be allowed to register service workers. Only secure and
+  // trustworthy schemes should be added.
+  virtual void AddServiceWorkerSchemes(std::set<std::string>* schemes) {}
+
  private:
   friend class ContentClientInitializer;  // To set these pointers.
   friend class InternalTestInitializer;