ServiceWorker: Add an API to fallback to renderer for CORS preflight

content/browser/service_worker/service_worker_controllee_request_handler.cc

 // 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.
 
 #include "content/browser/service_worker/service_worker_controllee_request_handler.h"
 
 #include <memory>
 #include <set>
 #include <string>
 
@@ skipping 267 matching lines @@
     ServiceWorkerVersion* version) {
   // The job may have been canceled and then destroyed before this was invoked.
   if (!job_)
     return;
 
   if (provider_host_)
     provider_host_->SetAllowAssociation(true);
   if (version != registration->active_version() ||
       version->status() != ServiceWorkerVersion::ACTIVATED ||
       !provider_host_) {
-    job_->FallbackToNetwork();
+    job_->FallbackToNetworkOrRenderer();

[falken, 2016/07/07 01:11:12]

Sorry I no longer understand this. We only get here from
DidLookupRegistrationForMainResource only, which means job_ is for a main
resource request. So FallbackToNetworkOrRenderer would always FallbackToNetwork,
no?

Same for the call sites below.

[shimazu, 2016/07/07 05:02:32]

Ah, yes, it seems correct. Actually I'd like to use FallbackToNetworkOrRenderer
at the next patch:  http://crrev.com/2103063002.
Fixed.

     return;
   }
 
   ServiceWorkerMetrics::CountControlledPageLoad(
       stripped_url_, version->has_fetch_handler(), is_main_frame_load_);
 
   provider_host_->AssociateRegistration(registration,
                                         false /* notify_controllerchange */);
   job_->ForwardToServiceWorker();
 }
 
 void ServiceWorkerControlleeRequestHandler::DidUpdateRegistration(
     const scoped_refptr<ServiceWorkerRegistration>& original_registration,
     ServiceWorkerStatusCode status,
     const std::string& status_message,
     int64_t registration_id) {
   DCHECK(force_update_started_);
 
   // The job may have been canceled and then destroyed before this was invoked.
   if (!job_)
     return;
 
   if (!context_) {
-    job_->FallbackToNetwork();
+    job_->FallbackToNetworkOrRenderer();
     return;
   }
   if (status != SERVICE_WORKER_OK ||
       !original_registration->installing_version()) {
     // Update failed. Look up the registration again since the original
     // registration was possibly unregistered in the meantime.
     context_->storage()->FindRegistrationForDocument(
         stripped_url_, base::Bind(&self::DidLookupRegistrationForMainResource,
                                   weak_factory_.GetWeakPtr()));
     return;
@@ skipping 12 matching lines @@
 }
 
 void ServiceWorkerControlleeRequestHandler::OnUpdatedVersionStatusChanged(
     const scoped_refptr<ServiceWorkerRegistration>& registration,
     const scoped_refptr<ServiceWorkerVersion>& version) {
   // The job may have been canceled and then destroyed before this was invoked.
   if (!job_)
     return;
 
   if (!context_) {
-    job_->FallbackToNetwork();
+    job_->FallbackToNetworkOrRenderer();
     return;
   }
   if (version->status() == ServiceWorkerVersion::ACTIVATED ||
       version->status() == ServiceWorkerVersion::REDUNDANT) {
     // When the status is REDUNDANT, the update failed (eg: script error), we
     // continue with the incumbent version.
     // In case unregister job may have run, look up the registration again.
     context_->storage()->FindRegistrationForDocument(
         stripped_url_, base::Bind(&self::DidLookupRegistrationForMainResource,
                                   weak_factory_.GetWeakPtr()));
@@ skipping 45 matching lines @@
   DCHECK(provider_host_);
   // Detach the controller so subresource requests also skip the worker.
   provider_host_->NotifyControllerLost();
 }
 
 void ServiceWorkerControlleeRequestHandler::ClearJob() {
   job_.reset();
 }
 
 }  // namespace content