Start autoplay muted videos with autoplay attribute when they are visible.

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/ScriptWrappable.h"
 #include "core/dom/IntersectionObservation.h"
 #include "core/dom/IntersectionObserverEntry.h"
@@ skipping 10 matching lines @@
 class IntersectionObserverCallback;
 class IntersectionObserverInit;
 
 class CORE_EXPORT IntersectionObserver final : public GarbageCollectedFinalized<IntersectionObserver>, public ScriptWrappable {
     DEFINE_WRAPPERTYPEINFO();
 
 public:
     static IntersectionObserver* create(const IntersectionObserverInit&, IntersectionObserverCallback&, ExceptionState&);
     static void resumeSuspendedObservers();
 
-    // API methods
+    IntersectionObserver(IntersectionObserverCallback&, Node&, const Vector<Length>& rootMargin, const Vector<float>& thresholds);
+
+    // JS API methods.
     void observe(Element*, ExceptionState&);

[esprehn, 2016/06/14 16:01:18]

void observe(Element*, ExceptionState& = ASSERT_NO_EXCEPTION);
void unobserve(Element*, ExceptionState& = ASSERT_NO_EXCEPTION);

     void unobserve(Element*, ExceptionState&);
     void disconnect(ExceptionState&);
     HeapVector<Member<IntersectionObserverEntry>> takeRecords(ExceptionState&);
 
-    // API attributes
+    // JS API attributes.
     Element* root() const;
     String rootMargin() const;
     const Vector<float>& thresholds() const { return m_thresholds; }
 
+    // C++ API methods.
+    void observe(Element*);
+    void unobserve(Element*);

[esprehn, 2016/06/14 16:01:18]

remove

+
     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; }
 
     DECLARE_TRACE();
 
 private:
-    explicit IntersectionObserver(IntersectionObserverCallback&, Node&, const Vector<Length>& rootMargin, const Vector<float>& thresholds);
     void clearWeakMembers(Visitor*);
 
     Member<IntersectionObserverCallback> m_callback;
     WeakMember<Node> m_root;
     HeapLinkedHashSet<WeakMember<IntersectionObservation>> m_observations;
     HeapVector<Member<IntersectionObserverEntry>> m_entries;
     Vector<float> m_thresholds;
     Length m_topMargin;
     Length m_rightMargin;
     Length m_bottomMargin;
     Length m_leftMargin;
 };
 
 } // namespace blink
 
 #endif // IntersectionObserver_h