Implement ReadableStream as a V8 extra

Source/core/streams/StreamTest.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 "core/streams/ScriptQueuingStrategy.h"
+#include "core/streams/ScriptUnderlyingSource.h"
+#include "bindings/core/v8/ScriptPromise.h"
+#include "core/streams/StreamTest.h"
+#include <v8.h>
+
+namespace blink {
+
+class TestUnderlyingSource : public ScriptUnderlyingSource {
+public:
+    TestUnderlyingSource(ScriptState* state) : m_scriptState(state) { };
+
+    ScriptPromise startImpl() override
+    {
+        controller().close();
+        return ScriptPromise::cast(m_scriptState, ScriptValue::createNull(m_scriptState));
+        // Use controller().enqueue(), controller().close(), controller().error()
+    };
+    ScriptPromise pullImpl() override
+    {
+        return ScriptPromise::cast(m_scriptState, ScriptValue::createNull(m_scriptState));
+        // Use controller().enqueue(), controller().close(), controller().error()
+    };
+    ScriptPromise cancelImpl(ScriptValue reason) override
+    {
+        return ScriptPromise::cast(m_scriptState, ScriptValue::createNull(m_scriptState));
+        // Do any cancel stuff, maybe using reason.
+    };
+
+private:
+    ScriptState* m_scriptState;
+};
+
+class TestQueuingStrategy : public ScriptQueuingStrategy {
+public:
+//    using ScriptQueuingStrategy::ScriptQueuingStrategy;
+    TestQueuingStrategy(double hwm) : ScriptQueuingStrategy(hwm) { };
+
+    double size(ScriptValue chunk) override {
+        return 0;
+    }
+};
+
+ScriptReadableStream StreamTest::test(ScriptState* scriptState)
+{
+    // Aaaaah I have no idea how C++ works :( pointers :(
+    auto us = new TestUnderlyingSource(scriptState);
+    auto qs = new TestQueuingStrategy(1024.0);
+    return ScriptReadableStream(scriptState, us, qs);
+}
+
+DEFINE_TRACE(StreamTest)
+{
+}
+
+}