Intersection Observer first draft

Source/bindings/core/v8/custom/V8IntersectionObserverCustom.cpp

+// Copyright 2015 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 "config.h"
+#include "bindings/core/v8/V8IntersectionObserver.h"
+
+#include "bindings/core/v8/ExceptionMessages.h"
+#include "bindings/core/v8/ExceptionState.h"
+#include "bindings/core/v8/V8Binding.h"
+#include "bindings/core/v8/V8DOMWrapper.h"
+#include "bindings/core/v8/V8GCController.h"
+#include "bindings/core/v8/V8IntersectionObserverCallback.h"
+
+namespace blink {
+
+void V8IntersectionObserver::constructorCustom(const v8::FunctionCallbackInfo<v8::Value>& info)
+{
+    if (UNLIKELY(info.Length() < 1)) {
+        V8ThrowException::throwException(createMinimumArityTypeErrorForMethod(info.GetIsolate(), "createIntersectionObserver", "Intersection", 1, info.Length()), info.GetIsolate());
+        return;
+    }
+
+    v8::Local<v8::Object> wrapper = info.Holder();
+
+    Document* document = nullptr;
+    DOMWindow* window = toDOMWindow(wrapper->CreationContext());
+    if (window)
+        document = window->document();
+
+    if (info.Length() <= 0 || !info[0]->IsFunction()) {
+        V8ThrowException::throwTypeError(info.GetIsolate(), ExceptionMessages::failedToExecute("createIntersectionObserver", "Intersection", "The callback provided as parameter 1 is not a function."));
+        return;
+    }
+
+    OwnPtrWillBeRawPtr<IntersectionObserverCallback> callback = V8IntersectionObserverCallback::create(v8::Local<v8::Function>::Cast(info[0]), wrapper, ScriptState::current(info.GetIsolate()));
+    RefPtrWillBeRawPtr<IntersectionObserver> observer = IntersectionObserver::create(document, callback.release());
+
+    v8SetReturnValue(info, V8DOMWrapper::associateObjectWithWrapper(info.GetIsolate(), observer.get(), &wrapperTypeInfo, wrapper));
+}
+
+} // namespace blink