Adding Blink bindings for WebGL 2

Source/core/html/canvas/WebGLSync.h

Index: Source/core/html/canvas/WebGLSync.h
diff --git a/Source/core/html/canvas/WebGLSync.h b/Source/core/html/canvas/WebGLSync.h
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+// 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 WebGLSync_h
+#define WebGLSync_h
+
+#include "core/html/canvas/WebGLSharedObject.h"
+
+namespace blink {
+
+class WebGL2RenderingContextBase;
+
+class WebGLSync : public WebGLSharedObject {
+    DEFINE_WRAPPERTYPEINFO();
+public:
+    ~WebGLSync() override;
+
+protected:
+    WebGLSync(WebGL2RenderingContextBase*, GLenum objectType);
+
+    void deleteObjectImpl(blink::WebGraphicsContext3D*, Platform3DObject) override;
+
+    GLenum objectType() const { return m_objectType; }
+
+private:
+    bool isSync() const override { return true; }
+
+    GLenum m_objectType;
+};
+
+} // namespace blink
+
+#endif // WebGLSync_h