Implement device-ram client hints header

third_party/WebKit/Source/core/loader/FrameFetchContext.h

 /*
  * Copyright (C) 2013 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 130 matching lines @@
                                const ResourceLoaderOptions&,
                                SecurityViolationReportingPolicy,
                                ResourceRequest&) override;
   void SetFirstPartyCookieAndRequestorOrigin(ResourceRequest&) override;
 
   // Exposed for testing.
   void ModifyRequestForCSP(ResourceRequest&);
   void AddClientHintsIfNecessary(const ClientHintsPreferences&,
                                  const FetchParameters::ResourceWidth&,
                                  ResourceRequest&);
+  static float ClientHintsDeviceRAM(int64_t physical_memory_mb);
 
   MHTMLArchive* Archive() const override;
 
   std::unique_ptr<WebURLLoader> CreateURLLoader(
       const ResourceRequest&) override;
 
   DECLARE_VIRTUAL_TRACE();
 
  private:
   FrameFetchContext(DocumentLoader*, Document*);
@@ skipping 37 matching lines @@
   Member<DocumentLoader> document_loader_;
   // FIXME: Oilpan: Ideally this should just be a traced Member but that will
   // currently leak because ComputedStyle and its data are not on the heap.
   // See crbug.com/383860 for details.
   WeakMember<Document> document_;
 };
 
 }  // namespace blink
 
 #endif