Adding Blink bindings for WebGL 2

Source/core/html/canvas/WebGL2RenderingContext.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 WebGL2RenderingContext_h
+#define WebGL2RenderingContext_h
+
+#include "core/html/canvas/WebGL2RenderingContextBase.h"
+
+namespace blink {
+
+class WebGL2RenderingContext : public WebGL2RenderingContextBase {
+    DEFINE_WRAPPERTYPEINFO();
+public:
+    static PassOwnPtrWillBeRawPtr<WebGL2RenderingContext> create(HTMLCanvasElement*, const CanvasContextCreationAttributes&);
+    ~WebGL2RenderingContext() override;
+
+    unsigned version() const override { return 2; }
+    String contextName() const override { return "WebGL2RenderingContext"; }
+    void registerContextExtensions() override;
+
+    void trace(Visitor*) override;
+
+protected:
+    WebGL2RenderingContext(HTMLCanvasElement* passedCanvas, PassOwnPtr<blink::WebGraphicsContext3D>, const WebGLContextAttributes& requestedAttributes);
+
+    RefPtr<WebGLDebugRendererInfo> m_webglDebugRendererInfo;
+    RefPtr<WebGLDebugShaders> m_webglDebugShaders;
+};
+
+DEFINE_TYPE_CASTS(WebGL2RenderingContext, CanvasRenderingContext, context,
+    context->is3d() && WebGLRenderingContextBase::getWebGLVersion(context) == 2,
+    context.is3d() && WebGLRenderingContextBase::getWebGLVersion(&context) == 2);
+
+} // namespace blink
+
+#endif