DOM-based SVG resource tracking

third_party/WebKit/Source/core/layout/svg/SVGResourcesCache.h

 /*
  * Copyright (C) Research In Motion Limited 2010. All rights reserved.
  *
  * 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.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 12 matching lines @@
 #include <memory>
 #include "core/style/StyleDifference.h"
 #include "platform/wtf/Allocator.h"
 #include "platform/wtf/HashMap.h"
 #include "platform/wtf/Noncopyable.h"
 
 namespace blink {
 
 class LayoutObject;
 class ComputedStyle;
-class LayoutSVGResourceContainer;
 class SVGResources;
 
 class SVGResourcesCache {
   WTF_MAKE_NONCOPYABLE(SVGResourcesCache);
   USING_FAST_MALLOC(SVGResourcesCache);
 
  public:
   SVGResourcesCache();
   ~SVGResourcesCache();
 
@@ skipping 11 matching lines @@
   static void ClientDestroyed(LayoutObject*);
 
   // Called from all SVG layoutObjects layout() methods.
   static void ClientLayoutChanged(LayoutObject*);
 
   // Called from all SVG layoutObjects styleDidChange() methods.
   static void ClientStyleChanged(LayoutObject*,
                                  StyleDifference,
                                  const ComputedStyle& new_style);
 
+  // Called when the target element of a resource referenced by the
+  // LayoutObject may have changed.
+  static void ResourceReferenceChanged(LayoutObject&);
+
   class TemporaryStyleScope {
     WTF_MAKE_NONCOPYABLE(TemporaryStyleScope);
     STACK_ALLOCATED();
 
    public:
     TemporaryStyleScope(LayoutObject&,
                         const ComputedStyle& original_style,
                         const ComputedStyle& temporary_style);
     ~TemporaryStyleScope() { SwitchTo(original_style_); }
 
    private:
     void SwitchTo(const ComputedStyle&);
 
     LayoutObject& layout_object_;
     const ComputedStyle& original_style_;
     const bool styles_are_equal_;
   };
 
  private:
   void AddResourcesFromLayoutObject(LayoutObject*, const ComputedStyle&);
   void RemoveResourcesFromLayoutObject(LayoutObject*);
 
   typedef HashMap<const LayoutObject*, std::unique_ptr<SVGResources>> CacheMap;
   CacheMap cache_;
 };
 
 }  // namespace blink
 
 #endif