Add Accept-CH meta http-equiv support to the preloader.

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/Resource.h"
 #include "wtf/text/TextPosition.h"
 
 namespace blink {
 
 class Document;
 
 class PreloadRequest {
 public:
-    static PassOwnPtr<PreloadRequest> create(const String& initiatorName, const TextPosition& initiatorPosition, const String& resourceURL, const KURL& baseURL, Resource::Type resourceType, const FetchRequest::ResourceWidth& resourceWidth = FetchRequest::ResourceWidth())
+    static PassOwnPtr<PreloadRequest> create(const String& initiatorName, const TextPosition& initiatorPosition, const String& resourceURL, const KURL& baseURL, Resource::Type resourceType, const FetchRequest::ResourceWidth& resourceWidth = FetchRequest::ResourceWidth(), const ClientHintsPreferences& clientHintsPreferences = ClientHintsPreferences())
     {
-        return adoptPtr(new PreloadRequest(initiatorName, initiatorPosition, resourceURL, baseURL, resourceType, resourceWidth));
+        return adoptPtr(new PreloadRequest(initiatorName, initiatorPosition, resourceURL, baseURL, resourceType, resourceWidth, clientHintsPreferences));
     }
 
     bool isSafeToSendToAnotherThread() const;
 
     FetchRequest resourceRequest(Document*);
 
     const String& charset() const { return m_charset; }
     double discoveryTime() const { return m_discoveryTime; }
     void setDefer(FetchRequest::DeferOption defer) { m_defer = defer; }
     void setCharset(const String& charset) { m_charset = charset.isolatedCopy(); }
     void setCrossOriginEnabled(StoredCredentials allowCredentials)
     {
         m_isCORSEnabled = true;
         m_allowCredentials = allowCredentials;
     }
 
     Resource::Type resourceType() const { return m_resourceType; }
 
     const String& resourceURL() const { return m_resourceURL; }
     float resourceWidth() const { return m_resourceWidth.isSet ? m_resourceWidth.width : 0; }
     const String& baseURL() const { return m_baseURL.string(); }
 
 private:
-    PreloadRequest(const String& initiatorName, const TextPosition& initiatorPosition, const String& resourceURL, const KURL& baseURL, Resource::Type resourceType, const FetchRequest::ResourceWidth& resourceWidth)
+    PreloadRequest(const String& initiatorName,
+        const TextPosition& initiatorPosition,
+        const String& resourceURL,
+        const KURL& baseURL,
+        Resource::Type resourceType,
+        const FetchRequest::ResourceWidth& resourceWidth,
+        const ClientHintsPreferences& clientHintsPreferences)
         : m_initiatorName(initiatorName)
         , m_initiatorPosition(initiatorPosition)
         , m_resourceURL(resourceURL.isolatedCopy())
         , m_baseURL(baseURL.copy())
         , m_resourceType(resourceType)
         , m_isCORSEnabled(false)
         , m_allowCredentials(DoNotAllowStoredCredentials)
         , m_discoveryTime(monotonicallyIncreasingTime())
         , m_defer(FetchRequest::NoDefer)
         , m_resourceWidth(resourceWidth)
+        , m_clientHintsPreferences(clientHintsPreferences)
     {
     }
 
     KURL completeURL(Document*);
 
     String m_initiatorName;
     TextPosition m_initiatorPosition;
     String m_resourceURL;
     KURL m_baseURL;
     String m_charset;
     Resource::Type m_resourceType;
     bool m_isCORSEnabled;
     StoredCredentials m_allowCredentials;
     double m_discoveryTime;
     FetchRequest::DeferOption m_defer;
     FetchRequest::ResourceWidth m_resourceWidth;
+    ClientHintsPreferences m_clientHintsPreferences;
 };
 
 typedef Vector<OwnPtr<PreloadRequest>> PreloadRequestStream;
 
 }
 
 #endif