IntersectionObserver: second cut.

third_party/WebKit/Source/bindings/core/v8/V8IntersectionObserverCallback.h

Index: third_party/WebKit/Source/bindings/core/v8/V8IntersectionObserverCallback.h
diff --git a/third_party/WebKit/Source/bindings/core/v8/V8IntersectionObserverCallback.h b/third_party/WebKit/Source/bindings/core/v8/V8IntersectionObserverCallback.h
new file mode 100644
index 0000000000000000000000000000000000000000..34f167c057dbe98c4440a0ce7b94e353e0e53ddb
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+++ b/third_party/WebKit/Source/bindings/core/v8/V8IntersectionObserverCallback.h
@@ -0,0 +1,35 @@
+// 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 V8IntersectionObserverCallback_h
+#define V8IntersectionObserverCallback_h
+
+#include "bindings/core/v8/ActiveDOMCallback.h"
+#include "bindings/core/v8/DOMWrapperWorld.h"
+#include "bindings/core/v8/ScopedPersistent.h"
+#include "core/CoreExport.h"
+#include "core/dom/IntersectionObserverCallback.h"
+
+namespace blink {
+
+class V8IntersectionObserverCallback final : public IntersectionObserverCallback, public ActiveDOMCallback {
+    WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(V8IntersectionObserverCallback);
+public:
+    CORE_EXPORT V8IntersectionObserverCallback(v8::Local<v8::Function>, v8::Local<v8::Object>, ScriptState*);
+    ~V8IntersectionObserverCallback() override;
+
+    DECLARE_VIRTUAL_TRACE();
+
+    void handleEvent(const HeapVector<Member<IntersectionObserverEntry>>&, IntersectionObserver&) override;
+    ExecutionContext* executionContext() const override { return ContextLifecycleObserver::executionContext(); }
+private:
+
+    static void setWeakCallback(const v8::WeakCallbackInfo<V8IntersectionObserverCallback>&);
+
+    ScopedPersistent<v8::Function> m_callback;
+    RefPtr<ScriptState> m_scriptState;
+};
+
+}
+#endif // V8IntersectionObserverCallback_h