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diff --git a/Source/WebCore/html/canvas/WebGL2RenderingContext.h b/Source/WebCore/html/canvas/WebGL2RenderingContext.h
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+++ b/Source/WebCore/html/canvas/WebGL2RenderingContext.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
+
+#if ENABLE(WEBGL2)
+
+#include "WebGLRenderingContextBase.h"
+
+namespace WebCore {
+
+class WebGLQuery;
+class WebGLSampler;
+class WebGLSync;
+class WebGLTransformFeedback;
+class WebGLVertexArrayObject;
+
+class WebGL2RenderingContext final : public WebGLRenderingContextBase {
+public:
+    WebGL2RenderingContext(HTMLCanvasElement&, WebGLContextAttributes);
+    WebGL2RenderingContext(HTMLCanvasElement&, Ref<GraphicsContext3D>&&, WebGLContextAttributes);
+
+    // Buffer objects
+    using WebGLRenderingContextBase::bufferData;
+    using WebGLRenderingContextBase::bufferSubData;
+    void bufferData(GC3Denum target, const ArrayBufferView& data, GC3Denum usage, GC3Duint srcOffset, GC3Duint length);
+    void bufferSubData(GC3Denum target, long long offset, const ArrayBufferView& data, GC3Duint srcOffset, GC3Duint length);
+    void copyBufferSubData(GC3Denum readTarget, GC3Denum writeTarget, GC3Dint64 readOffset, GC3Dint64 writeOffset, GC3Dint64 size);
+    void getBufferSubData(GC3Denum target, long long srcByteOffset, RefPtr<ArrayBufferView>&& dstData, GC3Duint dstOffset = 0, GC3Duint length = 0);
+    
+    // Framebuffer objects
+    WebGLAny getFramebufferAttachmentParameter(GC3Denum target, GC3Denum attachment, GC3Denum pname) final;
+    void blitFramebuffer(GC3Dint srcX0, GC3Dint srcY0, GC3Dint srcX1, GC3Dint srcY1, GC3Dint dstX0, GC3Dint dstY0, GC3Dint dstX1, GC3Dint dstY1, GC3Dbitfield mask, GC3Denum filter);
+    void framebufferTextureLayer(GC3Denum target, GC3Denum attachment, GC3Duint texture, GC3Dint level, GC3Dint layer);
+    WebGLAny getInternalformatParameter(GC3Denum target, GC3Denum internalformat, GC3Denum pname);
+    void invalidateFramebuffer(GC3Denum target, const Vector<GC3Denum>& attachments);
+    void invalidateSubFramebuffer(GC3Denum target, const Vector<GC3Denum>& attachments, GC3Dint x, GC3Dint y, GC3Dsizei width, GC3Dsizei height);
+    void readBuffer(GC3Denum src);
+    
+    // Renderbuffer objects
+    void renderbufferStorageMultisample(GC3Denum target, GC3Dsizei samples, GC3Denum internalformat, GC3Dsizei width, GC3Dsizei height);
+    
+    // Texture objects
+    void texStorage2D(GC3Denum target, GC3Dsizei levels, GC3Denum internalFormat, GC3Dsizei width, GC3Dsizei height);
+    void texStorage3D(GC3Denum target, GC3Dsizei levels, GC3Denum internalFormat, GC3Dsizei width, GC3Dsizei height, GC3Dsizei depth);
+    void texImage3D(GC3Denum target, GC3Dint level, GC3Dint internalformat, GC3Dsizei width, GC3Dsizei height, GC3Dsizei depth, GC3Dint border, GC3Denum format, GC3Denum type, RefPtr<ArrayBufferView>&& pixels);
+
+    void texSubImage3D(GC3Denum target, GC3Dint level, GC3Dint xoffset, GC3Dint yoffset, GC3Dint zoffset, GC3Dsizei width, GC3Dsizei height, GC3Dsizei depth, GC3Denum format, GC3Denum type, RefPtr<ArrayBufferView>&& pixels);
+    using TexImageSource = WTF::Variant<RefPtr<ImageData>, RefPtr<HTMLImageElement>, RefPtr<HTMLCanvasElement>, RefPtr<HTMLVideoElement>>;
+    void texSubImage3D(GC3Denum target, GC3Dint level, GC3Dint xoffset, GC3Dint yoffset, GC3Dint zoffset, GC3Denum format, GC3Denum type, TexImageSource&&);
+
+    void copyTexSubImage3D(GC3Denum target, GC3Dint level, GC3Dint xoffset, GC3Dint yoffset, GC3Dint zoffset, GC3Dint x, GC3Dint y, GC3Dsizei width, GC3Dsizei height);
+    void compressedTexImage3D(GC3Denum target, GC3Dint level, GC3Denum internalformat, GC3Dsizei width, GC3Dsizei height, GC3Dsizei depth, GC3Dint border, GC3Dsizei imageSize, RefPtr<ArrayBufferView>&& data);
+    void compressedTexSubImage3D(GC3Denum target, GC3Dint level, GC3Dint xoffset, GC3Dint yoffset, GC3Dint zoffset, GC3Dsizei width, GC3Dsizei height, GC3Dsizei depth, GC3Denum format, GC3Dsizei imageSize, RefPtr<ArrayBufferView>&& data);
+    
+    // Programs and shaders
+    GC3Dint getFragDataLocation(WebGLProgram*, const String& name);
+    
+    // Uniforms and attributes
+    void uniform1ui(WebGLUniformLocation*, GC3Duint v0);
+    void uniform2ui(WebGLUniformLocation*, GC3Duint v0, GC3Duint v1);
+    void uniform3ui(WebGLUniformLocation*, GC3Duint v0, GC3Duint v1, GC3Duint v2);
+    void uniform4ui(WebGLUniformLocation*, GC3Duint v0, GC3Duint v1, GC3Duint v2, GC3Duint v3);
+    void uniform1uiv(WebGLUniformLocation*, RefPtr<Uint32Array>&& value);
+    void uniform2uiv(WebGLUniformLocation*, RefPtr<Uint32Array>&& value);
+    void uniform3uiv(WebGLUniformLocation*, RefPtr<Uint32Array>&& value);
+    void uniform4uiv(WebGLUniformLocation*, RefPtr<Uint32Array>&& value);
+    void uniformMatrix2x3fv(WebGLUniformLocation*, GC3Dboolean transpose, RefPtr<Float32Array>&& value);
+    void uniformMatrix3x2fv(WebGLUniformLocation*, GC3Dboolean transpose, RefPtr<Float32Array>&& value);
+    void uniformMatrix2x4fv(WebGLUniformLocation*, GC3Dboolean transpose, RefPtr<Float32Array>&& value);
+    void uniformMatrix4x2fv(WebGLUniformLocation*, GC3Dboolean transpose, RefPtr<Float32Array>&& value);
+    void uniformMatrix3x4fv(WebGLUniformLocation*, GC3Dboolean transpose, RefPtr<Float32Array>&& value);
+    void uniformMatrix4x3fv(WebGLUniformLocation*, GC3Dboolean transpose, RefPtr<Float32Array>&& value);
+    void vertexAttribI4i(GC3Duint index, GC3Dint x, GC3Dint y, GC3Dint z, GC3Dint w);
+    void vertexAttribI4iv(GC3Duint index, RefPtr<Int32Array>&& v);
+    void vertexAttribI4ui(GC3Duint index, GC3Duint x, GC3Duint y, GC3Duint z, GC3Duint w);
+    void vertexAttribI4uiv(GC3Duint index, RefPtr<Uint32Array>&& v);
+    void vertexAttribIPointer(GC3Duint index, GC3Dint size, GC3Denum type, GC3Dsizei stride, GC3Dint64 offset);
+    
+    // Writing to the drawing buffer
+    void clear(GC3Dbitfield mask) final;
+    void vertexAttribDivisor(GC3Duint index, GC3Duint divisor);
+    void drawArraysInstanced(GC3Denum mode, GC3Dint first, GC3Dsizei count, GC3Dsizei instanceCount);
+    void drawElementsInstanced(GC3Denum mode, GC3Dsizei count, GC3Denum type, GC3Dint64 offset, GC3Dsizei instanceCount);
+    void drawRangeElements(GC3Denum mode, GC3Duint start, GC3Duint end, GC3Dsizei count, GC3Denum type, GC3Dint64 offset);
+    
+    // Multiple render targets
+    void drawBuffers(const Vector<GC3Denum>& buffers);
+    void clearBufferiv(GC3Denum buffer, GC3Dint drawbuffer, RefPtr<Int32Array>&& value);
+    void clearBufferuiv(GC3Denum buffer, GC3Dint drawbuffer, RefPtr<Uint32Array>&& value);
+    void clearBufferfv(GC3Denum buffer, GC3Dint drawbuffer, RefPtr<Float32Array>&& value);
+    void clearBufferfi(GC3Denum buffer, GC3Dint drawbuffer, GC3Dfloat depth, GC3Dint stencil);
+    
+    // Query objects
+    RefPtr<WebGLQuery> createQuery();
+    void deleteQuery(WebGLQuery*);
+    GC3Dboolean isQuery(WebGLQuery*);
+    void beginQuery(GC3Denum target, WebGLQuery*);
+    void endQuery(GC3Denum target);
+    RefPtr<WebGLQuery> getQuery(GC3Denum target, GC3Denum pname);
+    WebGLAny getQueryParameter(WebGLQuery*, GC3Denum pname);
+    
+    // Sampler objects
+    RefPtr<WebGLSampler> createSampler();
+    void deleteSampler(WebGLSampler*);
+    GC3Dboolean isSampler(WebGLSampler*);
+    void bindSampler(GC3Duint unit, WebGLSampler*);
+    void samplerParameteri(WebGLSampler*, GC3Denum pname, GC3Dint param);
+    void samplerParameterf(WebGLSampler*, GC3Denum pname, GC3Dfloat param);
+    WebGLAny getSamplerParameter(WebGLSampler*, GC3Denum pname);
+    
+    // Sync objects
+    RefPtr<WebGLSync> fenceSync(GC3Denum condition, GC3Dbitfield flags);
+    GC3Dboolean isSync(WebGLSync*);
+    void deleteSync(WebGLSync*);
+    GC3Denum clientWaitSync(WebGLSync*, GC3Dbitfield flags, GC3Duint64 timeout);
+    void waitSync(WebGLSync*, GC3Dbitfield flags, GC3Duint64 timeout);
+    WebGLAny getSyncParameter(WebGLSync*, GC3Denum pname);
+    
+    // Transform feedback
+    RefPtr<WebGLTransformFeedback> createTransformFeedback();
+    void deleteTransformFeedback(WebGLTransformFeedback* id);
+    GC3Dboolean isTransformFeedback(WebGLTransformFeedback* id);
+    void bindTransformFeedback(GC3Denum target, WebGLTransformFeedback* id);
+    void beginTransformFeedback(GC3Denum primitiveMode);
+    void endTransformFeedback();
+    void transformFeedbackVaryings(WebGLProgram*, const Vector<String>& varyings, GC3Denum bufferMode);
+    RefPtr<WebGLActiveInfo> getTransformFeedbackVarying(WebGLProgram*, GC3Duint index);
+    void pauseTransformFeedback();
+    void resumeTransformFeedback();
+    
+    // Uniform buffer objects and transform feedback buffers
+    void bindBufferBase(GC3Denum target, GC3Duint index, WebGLBuffer*);
+    void bindBufferRange(GC3Denum target, GC3Duint index, WebGLBuffer*, GC3Dint64 offset, GC3Dint64 size);
+    WebGLAny getIndexedParameter(GC3Denum target, GC3Duint index);
+    Uint32Array* getUniformIndices(WebGLProgram*, const Vector<String>& uniformNames);
+    Int32Array* getActiveUniforms(WebGLProgram*, RefPtr<Uint32Array>&& uniformIndices, GC3Denum pname);
+    GC3Duint getUniformBlockIndex(WebGLProgram*, const String& uniformBlockName);
+    WebGLAny getActiveUniformBlockParameter(WebGLProgram*, GC3Duint uniformBlockIndex, GC3Denum pname);
+    WebGLAny getActiveUniformBlockName(WebGLProgram*, GC3Duint uniformBlockIndex);
+    void uniformBlockBinding(WebGLProgram*, GC3Duint uniformBlockIndex, GC3Duint uniformBlockBinding);
+    
+    // Vertex array objects
+    RefPtr<WebGLVertexArrayObject> createVertexArray();
+    void deleteVertexArray(WebGLVertexArrayObject* vertexArray);
+    GC3Dboolean isVertexArray(WebGLVertexArrayObject* vertexArray);
+    void bindVertexArray(WebGLVertexArrayObject* vertexArray);
+    
+private:
+    bool isWebGL2() const final { return true; }
+
+    // Extensions
+    WebGLExtension* getExtension(const String&) final;
+    std::optional<Vector<String>> getSupportedExtensions() final;
+    WebGLAny getParameter(GC3Denum pname) final;
+
+    void renderbufferStorage(GC3Denum target, GC3Denum internalformat, GC3Dsizei width, GC3Dsizei height) final;
+    void hint(GC3Denum target, GC3Denum mode) final;
+
+    void initializeVertexArrayObjects() final;
+    GC3Dint getMaxDrawBuffers() final;
+    GC3Dint getMaxColorAttachments() final;
+    bool validateIndexArrayConservative(GC3Denum type, unsigned& numElementsRequired) final;
+    bool validateBlendEquation(const char* functionName, GC3Denum mode) final;
+    bool validateCapability(const char* functionName, GC3Denum cap) final;
+    bool validateFramebufferFuncParameters(const char* functionName, GC3Denum target, GC3Denum attachment) final;
+    
+    GC3Denum baseInternalFormatFromInternalFormat(GC3Denum internalformat);
+    bool isIntegerFormat(GC3Denum internalformat);
+    void initializeShaderExtensions();
+
+    bool validateTexStorageFuncParameters(GC3Denum target, GC3Dsizei levels, GC3Denum internalFormat, GC3Dsizei width, GC3Dsizei height, const char* functionName);
+};
+
+} // namespace WebCore
+
+SPECIALIZE_TYPE_TRAITS_CANVASRENDERINGCONTEXT(WebCore::WebGL2RenderingContext, isWebGL2())
+
+#endif // WEBGL2