Add HTMLPreloadScanner support for <link rel=preload>

third_party/WebKit/Source/core/html/parser/PreloadRequest.h

 // Copyright 2015 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 PreloadRequest_h
 #define PreloadRequest_h
 
 #include "core/fetch/ClientHintsPreferences.h"
 #include "core/fetch/FetchRequest.h"
 #include "core/fetch/IntegrityMetadata.h"
 #include "core/fetch/Resource.h"
 #include "platform/CrossOriginAttributeValue.h"
 #include "platform/weborigin/SecurityPolicy.h"
 #include "wtf/Allocator.h"
 #include "wtf/text/TextPosition.h"
 
 namespace blink {
 
 class Document;
 
 class PreloadRequest {
     USING_FAST_MALLOC(PreloadRequest);
 public:
-    enum RequestType { RequestTypePreload, RequestTypePreconnect };
+    enum RequestType { RequestTypePreload, RequestTypePreconnect, RequestTypeLinkRelPreload };
 
     static PassOwnPtr<PreloadRequest> create(const String& initiatorName, const TextPosition& initiatorPosition, const String& resourceURL, const KURL& baseURL, Resource::Type resourceType, const ReferrerPolicy referrerPolicy, const FetchRequest::ResourceWidth& resourceWidth = FetchRequest::ResourceWidth(), const ClientHintsPreferences& clientHintsPreferences = ClientHintsPreferences(), RequestType requestType = RequestTypePreload)
     {
         return adoptPtr(new PreloadRequest(initiatorName, initiatorPosition, resourceURL, baseURL, resourceType, resourceWidth, clientHintsPreferences, requestType, referrerPolicy));
     }
 
     bool isSafeToSendToAnotherThread() const;
 
     FetchRequest resourceRequest(Document*);
 
@@ skipping 67 matching lines @@
     RequestType m_requestType;
     ReferrerPolicy m_referrerPolicy;
     IntegrityMetadataSet m_integrityMetadata;
 };
 
 typedef Vector<OwnPtr<PreloadRequest>> PreloadRequestStream;
 
 }
 
 #endif