Implement device-ram client hints header

third_party/WebKit/Source/core/page/Page.h

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2013 Apple Inc. All rights
  * reserved.
  * Copyright (C) 2008 Torch Mobile Inc. All rights reserved.
  * (http://www.torchmobile.com/)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
@@ skipping 329 matching lines @@
   // discoverable via JS.
   // TODO(dcheng): Try to remove |DOMWindow::m_windowIsClosing| in favor of
   // this. However, this depends on resolving https://crbug.com/674641
   bool is_closing_;
 
   bool tab_key_cycles_through_elements_;
   bool suspended_;
 
   float device_scale_factor_;
 
+  float device_ram_;
+
   PageVisibilityState visibility_state_;
 
   bool is_cursor_visible_;
 
 #if DCHECK_IS_ON()
   bool is_painting_ = false;
 #endif
 
   int subframe_count_;
 };
 
 extern template class CORE_EXTERN_TEMPLATE_EXPORT Supplement<Page>;
 
 }  // namespace blink
 
 #endif  // Page_h