Implement OffscreenCanvas.getContext('webgl')

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

 /*
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 #ifndef WebGLRenderingContext_h
 #define WebGLRenderingContext_h
 
 #include "core/html/canvas/CanvasRenderingContextFactory.h"
+#include "modules/offscreencanvas/OffscreenCanvasRenderingContext.h"
+#include "modules/offscreencanvas/OffscreenCanvasRenderingContextFactory.h"
 #include "modules/webgl/WebGLRenderingContextBase.h"
 
 namespace blink {
 
 class CanvasContextCreationAttributes;
 
 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::ContextType getContextType() const override { return CanvasRenderingContext::ContextWebgl; }
         void onError(HTMLCanvasElement*, const String& error) override;
     };
 
+    class OffscreenCanvasFactory : public OffscreenCanvasRenderingContextFactory {
+        WTF_MAKE_NONCOPYABLE(OffscreenCanvasFactory);
+    public:
+        OffscreenCanvasFactory() {}
+        ~OffscreenCanvasFactory() override {}
+
+        OffscreenCanvasRenderingContext* create(ScriptState*, OffscreenCanvas*, const CanvasContextCreationAttributes& attrs) override;
+        OffscreenCanvasRenderingContext::ContextType getContextType() const override { return OffscreenCanvasRenderingContext::ContextWebgl; }
+        void onError(OffscreenCanvas* canvas, const String& error) override {}
+    };
+
     ~WebGLRenderingContext() override;
 
     CanvasRenderingContext::ContextType getContextType() const override { return CanvasRenderingContext::ContextWebgl; }
+    OffscreenCanvasRenderingContext::ContextType getOffscreenCanvasRenderingContextType() const override { return OffscreenCanvasRenderingContext::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<CHROMIUMSubscribeUniform> m_chromiumSubscribeUniform;
     Member<EXTBlendMinMax> m_extBlendMinMax;
     Member<EXTDisjointTimerQuery> m_extDisjointTimerQuery;
     Member<EXTFragDepth> m_extFragDepth;
     Member<EXTShaderTextureLOD> m_extShaderTextureLOD;
     Member<EXTsRGB> m_extsRGB;
     Member<EXTTextureFilterAnisotropic> m_extTextureFilterAnisotropic;
@@ skipping 16 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