Add use-counters for Client-Hints features

Source/core/fetch/ClientHintsPreferences.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 ClientHintsPreferences_h
 #define ClientHintsPreferences_h
 
 #include "core/CoreExport.h"
 #include "wtf/text/WTFString.h"
 
 namespace blink {
 
-class Document;
+class ResourceFetcher;
 
 class ClientHintsPreferences {
 public:
     ClientHintsPreferences()
         : m_shouldSendDPR(false)
         , m_shouldSendResourceWidth(false)
         , m_shouldSendViewportWidth(false)
     {
     }
 
@@ skipping 10 matching lines @@
     bool shouldSendDPR() const { return m_shouldSendDPR; }
     bool shouldSendResourceWidth() const { return m_shouldSendResourceWidth; }
     bool shouldSendViewportWidth() const { return m_shouldSendViewportWidth; }
 
 private:
     bool m_shouldSendDPR;
     bool m_shouldSendResourceWidth;
     bool m_shouldSendViewportWidth;
 };
 
-CORE_EXPORT void handleAcceptClientHintsHeader(const String& headerValue, ClientHintsPreferences&);
+CORE_EXPORT void handleAcceptClientHintsHeader(const String& headerValue, ClientHintsPreferences&, ResourceFetcher*);
 } // namespace blink
 #endif