[IntersectionObserver] Add isIntersecting field.

third_party/WebKit/Source/core/dom/IntersectionObserverEntry.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef IntersectionObserverEntry_h
 #define IntersectionObserverEntry_h
 
 #include "bindings/core/v8/ScriptWrappable.h"
 #include "core/dom/ClientRect.h"
 #include "core/dom/DOMHighResTimeStamp.h"
 #include "platform/geometry/IntRect.h"
 #include "platform/heap/Handle.h"
 
 namespace blink {
 
 class Element;
 
 class IntersectionObserverEntry final
     : public GarbageCollected<IntersectionObserverEntry>,
       public ScriptWrappable {
   DEFINE_WRAPPERTYPEINFO();
 
  public:
   IntersectionObserverEntry(DOMHighResTimeStamp timestamp,
                             double intersectionRatio,
                             const IntRect& boundingClientRect,
                             const IntRect* rootBounds,
                             const IntRect& intersectionRect,
+                            bool isIntersecting,
                             Element*);
 
   double time() const { return m_time; }
   double intersectionRatio() const { return m_intersectionRatio; }
   ClientRect* boundingClientRect() const { return m_boundingClientRect; }
   ClientRect* rootBounds() const { return m_rootBounds; }
   ClientRect* intersectionRect() const { return m_intersectionRect; }
+  bool isIntersecting() const { return m_isIntersecting; }
   Element* target() const { return m_target.get(); }
 
   DECLARE_VIRTUAL_TRACE();
 
  private:
   DOMHighResTimeStamp m_time;
   double m_intersectionRatio;
   Member<ClientRect> m_boundingClientRect;
   Member<ClientRect> m_rootBounds;
   Member<ClientRect> m_intersectionRect;
   Member<Element> m_target;
+  bool m_isIntersecting;
 };
 
 }  // namespace blink
 
 #endif  // IntersectionObserverEntry_h