Added basic client hints support.

Source/core/frame/LocalFrame.h

 /*
  * Copyright (C) 1998, 1999 Torben Weis <weis@kde.org>
  *                     1999-2001 Lars Knoll <knoll@kde.org>
  *                     1999-2001 Antti Koivisto <koivisto@kde.org>
  *                     2000-2001 Simon Hausmann <hausmann@kde.org>
  *                     2000-2001 Dirk Mueller <mueller@kde.org>
  *                     2000 Stefan Schimanski <1Stein@gmx.de>
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2008 Eric Seidel <eric@webkit.org>
@@ skipping 157 matching lines @@
         bool shouldReuseDefaultView(const KURL&) const;
         void removeSpellingMarkersUnderWords(const Vector<String>& words);
 
 #if ENABLE(OILPAN)
         void registerPluginElement(HTMLPlugInElement*);
         void unregisterPluginElement(HTMLPlugInElement*);
         void clearWeakMembers(Visitor*);
 #endif
         DisplayItemClient displayItemClient() const { return toDisplayItemClient(this); }
 
+        void setShouldSendDPRHint() { m_shouldSendDPRHint = true; }
+        void setShouldSendRWHint() { m_shouldSendRWHint = true; }
+        bool shouldSendDPRHint() { return m_shouldSendDPRHint; }
+        bool shouldSendRWHint() { return m_shouldSendRWHint; }
+
     // ========
 
     private:
         LocalFrame(FrameLoaderClient*, FrameHost*, FrameOwner*);
 
         String localLayerTreeAsText(unsigned flags) const;
 
         void detachView();
 
         // Paints the area for the given rect into a DragImage, with the given displayItemClient id attached.
@@ skipping 33 matching lines @@
         // See LocalFrame::clearWeakMembers().
         HashSet<HTMLPlugInElement*> m_pluginElements;
 #endif
 
         float m_pageZoomFactor;
         float m_textZoomFactor;
 
         bool m_inViewSourceMode;
 
         RefPtrWillBeMember<InstrumentingAgents> m_instrumentingAgents;
+
+        bool m_shouldSendDPRHint;

[Mike West, 2015/02/25 09:03:14]

How many hints will we end up with? Might it make sense to have a bitmasked flag
instead of lots of booleans?

+        bool m_shouldSendRWHint;
     };
 
     inline void LocalFrame::init()
     {
         m_loader.init();
     }
 
     inline LocalDOMWindow* LocalFrame::localDOMWindow() const
     {
         return m_domWindow.get();
@@ skipping 63 matching lines @@
     DEFINE_TYPE_CASTS(LocalFrame, Frame, localFrame, localFrame->isLocalFrame(), localFrame.isLocalFrame());
 
 } // namespace blink
 
 // During refactoring, there are some places where we need to do type conversions that
 // will not be needed once all instances of LocalFrame and RemoteFrame are sorted out.
 // At that time this #define will be removed and all the uses of it will need to be corrected.
 #define toLocalFrameTemporary toLocalFrame
 
 #endif // LocalFrame_h