[ServiceWorker] Set FetchRequestMode and handle wasFetchedViaServiceWorker.

Source/core/fetch/FetchRequest.cpp

 /*
  * Copyright (C) 2012 Google, Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 54 matching lines @@
     m_options.initiatorInfo = initiator;
 }
 
 FetchRequest::~FetchRequest()
 {
 }
 
 void FetchRequest::setCrossOriginAccessControl(SecurityOrigin* origin, StoredCredentials allowCredentials, CredentialRequest requested)
 {
     ASSERT(requested == ClientDidNotRequestCredentials || allowCredentials == AllowStoredCredentials);
+    m_resourceRequest.setFetchRequestMode(WebURLRequest::FetchRequestModeCORS);
     updateRequestForAccessControl(m_resourceRequest, origin, allowCredentials);
     m_options.allowCredentials = allowCredentials;
     m_options.corsEnabled = IsCORSEnabled;
     m_options.securityOrigin = origin;
     m_options.credentialsRequested = requested;
 }
 
 void FetchRequest::setCrossOriginAccessControl(SecurityOrigin* origin, StoredCredentials allowCredentials)
 {
     setCrossOriginAccessControl(origin, allowCredentials, allowCredentials == AllowStoredCredentials ? ClientRequestedCredentials : ClientDidNotRequestCredentials);
 }
 
 void FetchRequest::setCrossOriginAccessControl(SecurityOrigin* origin, const AtomicString& crossOriginMode)
 {
     setCrossOriginAccessControl(origin, equalIgnoringCase(crossOriginMode, "use-credentials") ? AllowStoredCredentials : DoNotAllowStoredCredentials);
 }
 
 } // namespace blink