Detect change on the intersection of video and viewport.

third_party/WebKit/Source/core/dom/IntersectionObserver.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 IntersectionObserver_h
 #define IntersectionObserver_h
 
 #include "bindings/core/v8/ExceptionStatePlaceholder.h"
 #include "bindings/core/v8/ScriptWrappable.h"
 #include "core/dom/IntersectionObservation.h"
 #include "core/dom/IntersectionObserverEntry.h"
 #include "platform/Length.h"
 #include "platform/heap/Handle.h"
 #include "wtf/HashSet.h"
 #include "wtf/Vector.h"
 
 namespace blink {
 
 class Document;
 class Element;
 class ExceptionState;
-class LayoutObject;
 class IntersectionObserverCallback;
 class IntersectionObserverInit;
 
 class CORE_EXPORT IntersectionObserver final
     : public GarbageCollectedFinalized<IntersectionObserver>,
       public ScriptWrappable {
   DEFINE_WRAPPERTYPEINFO();
 
  public:
   using EventCallback =
@@ skipping 24 matching lines @@
   void unobserve(Element*, ExceptionState& = ASSERT_NO_EXCEPTION);
   void disconnect(ExceptionState& = ASSERT_NO_EXCEPTION);
   HeapVector<Member<IntersectionObserverEntry>> takeRecords(ExceptionState&);
 
   // API attributes.
   Element* root() const;
   String rootMargin() const;
   const Vector<float>& thresholds() const { return m_thresholds; }
 
   Node* rootNode() const { return m_root.get(); }
-  LayoutObject* rootLayoutObject() const;
   const Length& topMargin() const { return m_topMargin; }
   const Length& rightMargin() const { return m_rightMargin; }
   const Length& bottomMargin() const { return m_bottomMargin; }
   const Length& leftMargin() const { return m_leftMargin; }
   void computeIntersectionObservations();
   void enqueueIntersectionObserverEntry(IntersectionObserverEntry&);
-  void applyRootMargin(LayoutRect&) const;
   unsigned firstThresholdGreaterThan(float ratio) const;
   void deliver();
   void removeObservation(IntersectionObservation&);
   bool hasEntries() const { return m_entries.size(); }
   const HeapLinkedHashSet<WeakMember<IntersectionObservation>>& observations()
       const {
     return m_observations;
   }
 
   // Set the assumed initial state of the observed element. Note that this can
@@ skipping 19 matching lines @@
   Length m_topMargin;
   Length m_rightMargin;
   Length m_bottomMargin;
   Length m_leftMargin;
   InitialState m_initialState;
 };
 
 }  // namespace blink
 
 #endif  // IntersectionObserver_h