[IntersectionObserver] Add isIntersecting field.

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

 // 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.
 
 #include "core/dom/IntersectionObserverEntry.h"
 
 #include "core/dom/Element.h"
 
 namespace blink {
 
 IntersectionObserverEntry::IntersectionObserverEntry(
     DOMHighResTimeStamp time,
     double intersectionRatio,
     const IntRect& boundingClientRect,
     const IntRect* rootBounds,
     const IntRect& intersectionRect,
+    bool isIntersecting,
     Element* target)
     : m_time(time),
       m_intersectionRatio(intersectionRatio),
       m_boundingClientRect(ClientRect::create(boundingClientRect)),
       m_rootBounds(rootBounds ? ClientRect::create(*rootBounds) : nullptr),
       m_intersectionRect(ClientRect::create(intersectionRect)),
-      m_target(target)
+      m_target(target),
+      m_isIntersecting(isIntersecting)
 
 {}
 
 DEFINE_TRACE(IntersectionObserverEntry) {
   visitor->trace(m_boundingClientRect);
   visitor->trace(m_rootBounds);
   visitor->trace(m_intersectionRect);
   visitor->trace(m_target);
 }
 
 }  // namespace blink