Add infrastructure for partial layouts

Source/core/rendering/RenderRubyRun.h

 /*
  * Copyright (C) 2009 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 56 matching lines @@
     static RenderRubyRun* staticCreateRubyRun(const RenderObject* parentRuby);
 
 protected:
     RenderRubyBase* createRubyBase() const;
 
 private:
     RenderRubyRun();
 
     virtual bool isRubyRun() const { return true; }
     virtual const char* renderName() const { return "RenderRubyRun (anonymous)"; }
+    virtual bool supportsPartialLayout() const OVERRIDE { return false; }
     virtual bool createsAnonymousWrapper() const { return true; }
     virtual void removeLeftoverAnonymousBlock(RenderBlock*) { }
 };
 
 inline RenderRubyRun* toRenderRubyRun(RenderObject* object)
 {
     ASSERT_WITH_SECURITY_IMPLICATION(!object || object->isRubyRun());
     return static_cast<RenderRubyRun*>(object);
 }
 
 inline const RenderRubyRun* toRenderRubyRun(const RenderObject* object)
 {
     ASSERT_WITH_SECURITY_IMPLICATION(!object || object->isBox());
     return static_cast<const RenderRubyRun*>(object);
 }
 
 void toRenderRubyRun(const RenderRubyRun*);
 
 } // namespace WebCore
 
 #endif // RenderRubyRun_h