Implement ReadableStream as a V8 extra

Source/core/streams/ScriptReadableStream.h

+// 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.
+
+#ifndef ScriptReadableStream_h
+#define ScriptReadableStream_h
+
+#include "bindings/core/v8/ScriptState.h"
+#include "bindings/core/v8/ScriptValue.h"
+#include "core/streams/ScriptQueuingStrategy.h"
+#include "core/streams/ScriptUnderlyingSource.h"
+#include <v8.h>
+
+namespace blink {
+
+class CORE_EXPORT ScriptReadableStream {
+public:
+    // This is for UA-created ReadableStreams
+    ScriptReadableStream(ScriptState*, ScriptUnderlyingSource*, ScriptQueuingStrategy*);
+
+    // TODO: also a constructor for converting author-created ReadableStreams, e.g. for use in the bindings for
+    // functions/setters that accept ReadableStream?
+
+    // TODO: add functions to manipulate and inspect the stream from C++ beyond just the abilities of the controller.
+    // E.g. getting readers and reading.
+
+    bool isObject() const
+    {
+        return m_stream.isObject();
+    }
+
+    bool isNull() const
+    {
+        return m_stream.isNull();
+    }
+
+    bool isUndefinedOrNull() const
+    {
+        return m_stream.isUndefined() || m_stream.isNull();
+    }
+
+    ScriptValue scriptValue() const
+    {
+        return m_stream;
+    }
+
+    v8::Local<v8::Value> v8Value() const
+    {
+        return m_stream.v8Value();
+    }
+
+    v8::Isolate* isolate() const
+    {
+        return m_stream.isolate();
+    }
+
+    bool isEmpty() const
+    {
+        return m_stream.isEmpty();
+    }
+
+    void clear()
+    {
+        m_stream.clear();
+    }
+
+    bool operator==(const ScriptReadableStream& value) const
+    {
+        return m_stream == value.m_stream;
+    }
+
+    bool operator!=(const ScriptReadableStream& value) const
+    {
+        return !operator==(value);
+    }
+
+private:
+    ScriptValue m_stream;
+};
+
+} // namespace blink
+
+#endif // ScriptReadableStream_h