First version of PerformanceObserver

Source/bindings/core/v8/custom/V8PerformanceObserverCustom.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/V8PerformanceObserver.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/V8Performance.h"
+#include "bindings/core/v8/V8PerformanceObserverCallback.h"
+#include "core/timing/DOMWindowPerformance.h"
+#include "core/timing/PerformanceObserver.h"
+
+namespace blink {
+
+void V8PerformanceObserver::constructorCustom(const v8::FunctionCallbackInfo<v8::Value>& info)
+{
+    if (UNLIKELY(info.Length() < 1)) {
+        V8ThrowException::throwException(createMinimumArityTypeErrorForMethod(info.GetIsolate(), "createPerformanceObserver", "Performance", 1, info.Length()), info.GetIsolate());
+        return;
+    }
+
+    v8::Local<v8::Object> wrapper = info.Holder();
+
+    Performance* performance = nullptr;
+    DOMWindow* window = toDOMWindow(wrapper->CreationContext());
+    if (window)

[esprehn, 2015/09/09 22:41:40]

Throw if there's no window? There should always be one.

[MikeB, 2015/09/10 19:53:01]

Done.

+        performance = DOMWindowPerformance::performance(*window);

[esprehn, 2015/09/09 22:41:40]

ASSERT(performance) ?

[MikeB, 2015/09/10 19:53:01]

Done.

+
+    PerformanceObserverCallback* callback;
+    {
+        if (info.Length() <= 0 || !info[0]->IsFunction()) {
+            V8ThrowException::throwTypeError(info.GetIsolate(), ExceptionMessages::failedToExecute("createPerformanceObserver", "Performance", "The callback provided as parameter 1 is not a function."));
+            return;
+        }
+        callback = V8PerformanceObserverCallback::create(v8::Local<v8::Function>::Cast(info[0]), wrapper, ScriptState::current(info.GetIsolate()));
+    }
+    PerformanceObserver* observer = PerformanceObserver::create(performance, callback);
+
+    v8SetReturnValue(info, V8DOMWrapper::associateObjectWithWrapper(info.GetIsolate(), observer, &wrapperTypeInfo, wrapper));
+}
+
+} // namespace blink