Adding Blink bindings for WebGL 2

Source/core/html/canvas/WebGLFenceSync.h

Index: Source/core/html/canvas/WebGLFenceSync.h
diff --git a/Source/core/html/canvas/WebGLFenceSync.h b/Source/core/html/canvas/WebGLFenceSync.h
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+++ b/Source/core/html/canvas/WebGLFenceSync.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 WebGLFenceSync_h
+#define WebGLFenceSync_h
+
+#include "core/html/canvas/WebGLSync.h"
+#include "wtf/PassRefPtr.h"
+
+namespace blink {
+
+class WebGL2RenderingContextBase;
+
+class WebGLFenceSync : public WebGLSync {
+public:
+    ~WebGLFenceSync() override;
+
+    static PassRefPtrWillBeRawPtr<WebGLSync> create(WebGL2RenderingContextBase*, GLenum condition, GLbitfield flags);
+
+protected:
+    WebGLFenceSync(WebGL2RenderingContextBase*, GLenum condition, GLbitfield flags);
+};
+
+} // namespace blink
+
+#endif // WebGLFenceSync_h