Add support for fallback content for the frame. This includes main and subframes.

content/browser/service_worker/service_worker_url_loader_job.cc

 // Copyright 2017 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.
 
 #include "content/browser/service_worker/service_worker_url_loader_job.h"
 
 #include "base/strings/stringprintf.h"
 #include "content/browser/blob_storage/blob_url_loader_factory.h"
 #include "content/browser/service_worker/service_worker_fetch_dispatcher.h"
 #include "content/browser/service_worker/service_worker_version.h"
@@ skipping 233 matching lines @@
     DeliverErrorResponse();
     return;
   }
 
   // Creates a new HttpResponseInfo using the the ServiceWorker script's
   // HttpResponseInfo to show HTTPS padlock.
   // TODO(horo): When we support mixed-content (HTTP) no-cors requests from a
   // ServiceWorker, we have to check the security level of the responses.
   const net::HttpResponseInfo* main_script_http_info =
       version->GetMainScriptHttpResponseInfo();
-  DCHECK(main_script_http_info);
-  ssl_info_ = main_script_http_info->ssl_info;
+  // TODO(kinuko)
+  // Fix this here.
+  if (main_script_http_info)
+    ssl_info_ = main_script_http_info->ssl_info;
 
   std::move(loader_callback_)
       .Run(base::Bind(&ServiceWorkerURLLoaderJob::StartResponse,
                       weak_factory_.GetWeakPtr(), response,
                       base::Passed(std::move(body_as_stream))));
 }
 
 void ServiceWorkerURLLoaderJob::StartResponse(
     const ServiceWorkerResponse& response,
     blink::mojom::ServiceWorkerStreamHandlePtr body_as_stream,
@@ skipping 91 matching lines @@
 }
 
 void ServiceWorkerURLLoaderJob::OnComplete(
     const ResourceRequestCompletionStatus& status) {
   DCHECK_EQ(Status::kSentHeader, status_);
   status_ = Status::kCompleted;
   url_loader_client_->OnComplete(status);
 }
 
 }  // namespace content