Adds a basic offline check to InstallableManager.

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>
 
 #include "base/callback_forward.h"
 #include "content/public/browser/service_worker_usage_info.h"
 #include "url/gurl.h"
 
 namespace blink {
 enum class WebNavigationHintType;
 }
 
 namespace content {
 
+enum class ServiceWorkerCapability {
+  NO_SERVICE_WORKER,
+  SERVICE_WORKER_NO_FETCH_HANDLER,
+  SERVICE_WORKER_WITH_FETCH_HANDLER,
+};
+
 // Represents the per-StoragePartition ServiceWorker data.
 class ServiceWorkerContext {
  public:
   // https://rawgithub.com/slightlyoff/ServiceWorker/master/spec/service_worker/index.html#url-scope:
   // roughly, must be of the form "<origin>/<path>/*".
   using Scope = GURL;
 
   using ResultCallback = base::Callback<void(bool success)>;
 
   using GetUsageInfoCallback = base::Callback<void(
       const std::vector<ServiceWorkerUsageInfo>& usage_info)>;
 
   using CheckHasServiceWorkerCallback =
-      base::Callback<void(bool has_service_worker)>;
+      base::Callback<void(ServiceWorkerCapability capability)>;
 
   using CountExternalRequestsCallback =
       base::Callback<void(size_t external_request_count)>;
 
   // 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.
@@ skipping 50 matching lines @@
   // Methods used in response to browsing data and quota manager requests.
 
   // Must be called from the IO thread.
   virtual void GetAllOriginsInfo(const GetUsageInfoCallback& callback) = 0;
 
   // This function can be called from any thread, but the callback will always
   // be called on the IO thread.
   virtual void DeleteForOrigin(const GURL& origin_url,
                                const ResultCallback& callback) = 0;
 
-  // Returns true if a Service Worker registration exists that matches |url|,
-  // and if |other_url| falls inside the scope of the same registration. Note
-  // this still returns true even if there is a Service Worker registration
-  // which has a longer match for |other_url|.
+  // Returns ServiceWorkerCapability describing existence and properties of a
+  // Service Worker registration matching |url|. Found service worker
+  // registration must also encompass the |other_url|, otherwise it will be
+  // considered non existent by this method. Note that the longest matching
+  // registration for |url| is described, which is not necessarily the longest
+  // matching registration for |other_url|. In case the service worker is being
+  // installed as of calling this method, it will wait for the installation to
+  // finish before coming back with the result.
   //
   // This function can be called from any thread, but the callback will always
   // be called on the UI thread.
   virtual void CheckHasServiceWorker(
       const GURL& url,
       const GURL& other_url,
       const CheckHasServiceWorkerCallback& callback) = 0;
 
   // Returns the pending external request count for the worker with the
   // specified |origin| via |callback|.
@@ skipping 27 matching lines @@
       const ResultCallback& callback) = 0;
 
  protected:
   ServiceWorkerContext() {}
   virtual ~ServiceWorkerContext() {}
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_SERVICE_WORKER_CONTEXT_H_