Check if there is a SW controlling the start page for app banner.

content/public/browser/service_worker_context.h

 // Copyright 2014 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_SERVICE_WORKER_CONTEXT_H_
 #define CONTENT_PUBLIC_BROWSER_SERVICE_WORKER_CONTEXT_H_
 
 #include <set>
 #include <string>
 
@@ skipping 14 matching lines @@
  public:
   // https://rawgithub.com/slightlyoff/ServiceWorker/master/spec/service_worker/index.html#url-scope:
   // roughly, must be of the form "<origin>/<path>/*".
   typedef GURL Scope;
 
   typedef base::Callback<void(bool success)> ResultCallback;
 
   typedef base::Callback<void(const std::vector<ServiceWorkerUsageInfo>&
                                   usage_info)> GetUsageInfoCallback;
 
+  typedef base::Callback<void(bool has_same_service_worker)>
+      CheckHasSameServiceWorkerCallback;
+
   // Registers the header name which should not be passed to the ServiceWorker.
   // Must be called from the IO thread.
   CONTENT_EXPORT static void AddExcludedHeadersForFetchEvent(
       const std::set<std::string>& header_names);
 
   // Returns true if the header name should not be passed to the ServiceWorker.
   // Must be called from the IO thread.
   static bool IsExcludedHeaderNameForFetchEvent(const std::string& header_name);
 
   // Retrieves the ServiceWorkerContext, if any, associated with |request|.
@@ skipping 21 matching lines @@
   // fulfilled or false when the JS promise is rejected.
   //
   // Unregistration can fail if:
   //  * No Service Worker was registered for |pattern|.
   //  * Something unexpected goes wrong, like a renderer crash.
   virtual void UnregisterServiceWorker(const Scope& pattern,
                                        const ResultCallback& callback) = 0;
 
   // TODO(jyasskin): Provide a way to SendMessage to a Scope.
 
-  // Determines if a request for 'url' can be satisfied while offline.
+  // Determines if a request for |url| can be satisfied while offline.
   // This method always completes asynchronously.
   virtual void CanHandleMainResourceOffline(const GURL& url,
                                             const GURL& first_party,
                                             const net::CompletionCallback&
                                             callback) = 0;
 
   // Methods used in response to browsing data and quota manager requests.
   virtual void GetAllOriginsInfo(const GetUsageInfoCallback& callback) = 0;
   virtual void DeleteForOrigin(const GURL& origin_url) = 0;
 
+  // Determines if |url| has a controlling Service Worker, and if that Service
+  // Worker also controls |other_url|.

[falken, 2015/02/05 10:26:11]

The language in the comment is a bit wrong, right now the function just checks
if there's a registration whose scope matches the URLs. "Controlling SW" implies
there's a ServiceWorkerVersion that is the .controller of an open page. This
should be something like "Determines if a Service Worker registration exists
that matches |url| and the same registration also matches |other_url|" and maybe
also "and has an active worker" depending on if you check .active().

[benwells, 2015/02/05 12:38:29]

Done.

+  virtual void CheckHasSameServiceWorker(
+      const GURL& url,
+      const GURL& other_url,
+      const CheckHasSameServiceWorkerCallback& callback) = 0;
+
  protected:
   ServiceWorkerContext() {}
   virtual ~ServiceWorkerContext() {}
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_SERVICE_WORKER_CONTEXT_H_