Implement OffscreenCanvas.getContext('webgl')

third_party/WebKit/Source/modules/webgl/WebGLRenderingContext.h

 /*
  * Copyright (C) 2009 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
@@ skipping 25 matching lines @@
 class WebGLRenderingContext final : public WebGLRenderingContextBase {
     DEFINE_WRAPPERTYPEINFO();
 public:
     class Factory : public CanvasRenderingContextFactory {
         WTF_MAKE_NONCOPYABLE(Factory);
     public:
         Factory() {}
         ~Factory() override {}
 
         CanvasRenderingContext* create(HTMLCanvasElement*, const CanvasContextCreationAttributes&, Document&) override;
+        CanvasRenderingContext* create(ScriptState*, OffscreenCanvas*, const CanvasContextCreationAttributes&) override;
         CanvasRenderingContext::ContextType getContextType() const override { return CanvasRenderingContext::ContextWebgl; }
         void onError(HTMLCanvasElement*, const String& error) override;
     };
 
     ~WebGLRenderingContext() override;
 
     CanvasRenderingContext::ContextType getContextType() const override { return CanvasRenderingContext::ContextWebgl; }
+    ImageBitmap* transferToImageBitmap(ExceptionState&) final;
     unsigned version() const override { return 1; }
     String contextName() const override { return "WebGLRenderingContext"; }
     void registerContextExtensions() override;
     void setCanvasGetContextResult(RenderingContext&) final;
+    void setOffscreenCanvasGetContextResult(OffscreenRenderingContext&) final;
 
     EAGERLY_FINALIZE();
     DECLARE_VIRTUAL_TRACE();
 
 private:
     WebGLRenderingContext(HTMLCanvasElement*, PassOwnPtr<WebGraphicsContext3DProvider>, const WebGLContextAttributes&);
+    WebGLRenderingContext(OffscreenCanvas*, PassOwnPtr<WebGraphicsContext3DProvider>, const WebGLContextAttributes&);
 
     // Enabled extension objects.
     Member<ANGLEInstancedArrays> m_angleInstancedArrays;
     Member<EXTBlendMinMax> m_extBlendMinMax;
     Member<EXTDisjointTimerQuery> m_extDisjointTimerQuery;
     Member<EXTFragDepth> m_extFragDepth;
     Member<EXTShaderTextureLOD> m_extShaderTextureLOD;
     Member<EXTsRGB> m_extsRGB;
     Member<EXTTextureFilterAnisotropic> m_extTextureFilterAnisotropic;
     Member<OESTextureFloat> m_oesTextureFloat;
@@ skipping 15 matching lines @@
     Member<WebGLDepthTexture> m_webglDepthTexture;
 };
 
 DEFINE_TYPE_CASTS(WebGLRenderingContext, CanvasRenderingContext, context,
     context->is3d() && WebGLRenderingContextBase::getWebGLVersion(context) == 1,
     context.is3d() && WebGLRenderingContextBase::getWebGLVersion(&context) == 1);
 
 } // namespace blink
 
 #endif // WebGLRenderingContext_h