Adds a basic offline check to InstallableManager.

content/browser/service_worker/service_worker_context_wrapper.cc

Index: content/browser/service_worker/service_worker_context_wrapper.cc
diff --git a/content/browser/service_worker/service_worker_context_wrapper.cc b/content/browser/service_worker/service_worker_context_wrapper.cc
index 69ffa22cbfea8504f31ea41c8e37a9f4f9ebc2a3..ff0ca566ab0bb9b39912bff0a5cab5605a5a541d 100644
--- a/content/browser/service_worker/service_worker_context_wrapper.cc
+++ b/content/browser/service_worker/service_worker_context_wrapper.cc
@@ -479,13 +479,13 @@ void ServiceWorkerContextWrapper::DidGetAllRegistrationsForGetAllOrigins(
   callback.Run(usage_infos);
 }
 
-void ServiceWorkerContextWrapper::DidCheckHasServiceWorker(
-    const CheckHasServiceWorkerCallback& callback,
-    bool has_service_worker) {
+void ServiceWorkerContextWrapper::DidCheckServiceWorkerStatus(
+    const CheckServiceWorkerStatusCallback& callback,
+    ServiceWorkerStatus status) {
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
 
   BrowserThread::PostTask(BrowserThread::UI, FROM_HERE,
-                          base::Bind(callback, has_service_worker));
+                          base::Bind(callback, status));
 }
 
 void ServiceWorkerContextWrapper::StopAllServiceWorkersForOrigin(
@@ -558,26 +558,27 @@ void ServiceWorkerContextWrapper::DeleteForOrigin(
       origin.GetOrigin(), base::Bind(&StatusCodeToBoolCallbackAdapter, result));
 }
 
-void ServiceWorkerContextWrapper::CheckHasServiceWorker(
+void ServiceWorkerContextWrapper::CheckServiceWorkerStatus(
     const GURL& url,
     const GURL& other_url,
-    const CheckHasServiceWorkerCallback& callback) {
+    const CheckServiceWorkerStatusCallback& callback) {
   if (!BrowserThread::CurrentlyOn(BrowserThread::IO)) {
     BrowserThread::PostTask(
         BrowserThread::IO, FROM_HERE,
-        base::Bind(&ServiceWorkerContextWrapper::CheckHasServiceWorker, this,
+        base::Bind(&ServiceWorkerContextWrapper::CheckServiceWorkerStatus, this,
                    url, other_url, callback));
     return;
   }
   if (!context_core_) {
-    BrowserThread::PostTask(BrowserThread::UI, FROM_HERE,
-                            base::Bind(callback, false));
+    BrowserThread::PostTask(
+        BrowserThread::UI, FROM_HERE,
+        base::Bind(callback, ServiceWorkerStatus::NO_SERVICE_WORKER));
     return;
   }
-  context()->CheckHasServiceWorker(
+  context()->CheckServiceWorkerStatus(
       net::SimplifyUrlForRequest(url), net::SimplifyUrlForRequest(other_url),
-      base::Bind(&ServiceWorkerContextWrapper::DidCheckHasServiceWorker, this,
-                 callback));
+      base::Bind(&ServiceWorkerContextWrapper::DidCheckServiceWorkerStatus,
+                 this, callback));
 }
 
 void ServiceWorkerContextWrapper::CountExternalRequestsForTest(