Implement device-ram client hints header

third_party/WebKit/Source/core/loader/private/FrameClientHintsPreferencesContext.h

 // Copyright 2016 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 FrameClientHintsPreferencesContext_h
 #define FrameClientHintsPreferencesContext_h
 
 #include "core/frame/LocalFrame.h"
 #include "platform/heap/Persistent.h"
 #include "platform/loader/fetch/ClientHintsPreferences.h"
 #include "platform/wtf/Allocator.h"
 
 namespace blink {
 
 class FrameClientHintsPreferencesContext final
     : public ClientHintsPreferences::Context {
   STACK_ALLOCATED();
 
  public:
   explicit FrameClientHintsPreferencesContext(LocalFrame*);
 
+  void CountClientHintsDeviceRAM() override;
   void CountClientHintsDPR() override;
   void CountClientHintsResourceWidth() override;
   void CountClientHintsViewportWidth() override;
 
  private:
   Member<LocalFrame> frame_;
 };
 
 }  // namespace blink
 
 #endif  // FrameClientHintsPreferencesContext_h