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diff --git a/Source/WebCore/html/canvas/WebGLVertexArrayObjectBase.h b/Source/WebCore/html/canvas/WebGLVertexArrayObjectBase.h
new file mode 100644
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+++ b/Source/WebCore/html/canvas/WebGLVertexArrayObjectBase.h
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+/*
+ * Copyright (C) 2015-2017 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include "WebGLBuffer.h"
+#include "WebGLContextObject.h"
+
+namespace WebCore {
+
+class WebGLVertexArrayObjectBase : public WebGLContextObject {
+public:
+    enum class Type { Default, User };
+
+    // Cached values for vertex attrib range checks
+    struct VertexAttribState {
+        bool isBound() const { return bufferBinding && bufferBinding->object(); }
+        bool validateBinding() const { return !enabled || isBound(); }
+        
+        bool enabled { false };
+        RefPtr<WebGLBuffer> bufferBinding;
+        GC3Dsizei bytesPerElement { 0 };
+        GC3Dint size { 4 };
+        GC3Denum type { GraphicsContext3D::FLOAT };
+        bool normalized { false };
+        GC3Dsizei stride { 16 };
+        GC3Dsizei originalStride { 0 };
+        GC3Dintptr offset { 0 };
+        GC3Duint divisor { 0 };
+    };
+
+    bool isDefaultObject() const { return m_type == Type::Default; }
+
+    bool hasEverBeenBound() const { return object() && m_hasEverBeenBound; }
+    void setHasEverBeenBound() { m_hasEverBeenBound = true; }
+
+    WebGLBuffer* getElementArrayBuffer() const { return m_boundElementArrayBuffer.get(); }
+    void setElementArrayBuffer(WebGLBuffer*);
+
+    VertexAttribState& getVertexAttribState(int index) { return m_vertexAttribState[index]; }
+    void setVertexAttribState(GC3Duint, GC3Dsizei, GC3Dint, GC3Denum, GC3Dboolean, GC3Dsizei, GC3Dintptr, WebGLBuffer&);
+    void unbindBuffer(WebGLBuffer&);
+
+    void setVertexAttribDivisor(GC3Duint index, GC3Duint divisor);
+
+protected:
+    WebGLVertexArrayObjectBase(WebGLRenderingContextBase&, Type);
+    void deleteObjectImpl(GraphicsContext3D*, Platform3DObject) override = 0;
+
+    Type m_type;
+    bool m_hasEverBeenBound { false };
+    RefPtr<WebGLBuffer> m_boundElementArrayBuffer;
+    Vector<VertexAttribState> m_vertexAttribState;
+};
+
+} // namespace WebCore