Implement OffscreenCanvas.getContext('webgl')

third_party/WebKit/Source/modules/offscreencanvas2d/OffscreenCanvasRenderingContext2D.h

 // Copyright 2016 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 OffscreenCanvasRenderingContext2D_h
 #define OffscreenCanvasRenderingContext2D_h
 
 #include "core/html/canvas/CanvasContextCreationAttributes.h"
 #include "core/html/canvas/CanvasRenderingContext.h"
 #include "core/html/canvas/CanvasRenderingContextFactory.h"
 #include "modules/canvas2d/BaseRenderingContext2D.h"
 
 namespace blink {
 
-class HTMLCanvasElement;
-
 class MODULES_EXPORT OffscreenCanvasRenderingContext2D final : public CanvasRenderingContext, public BaseRenderingContext2D {
     DEFINE_WRAPPERTYPEINFO();
     USING_GARBAGE_COLLECTED_MIXIN(OffscreenCanvasRenderingContext2D);
 public:
     class Factory : public CanvasRenderingContextFactory {
     public:
         Factory() {}
         ~Factory() override {}
 
-        CanvasRenderingContext* create(OffscreenCanvas* canvas, const CanvasContextCreationAttributes& attrs) override
+        CanvasRenderingContext* create(ScriptState* scriptState, OffscreenCanvas* canvas, const CanvasContextCreationAttributes& attrs) override
         {
             return new OffscreenCanvasRenderingContext2D(canvas, attrs);
         }
 
         CanvasRenderingContext::ContextType getContextType() const override
         {
             return CanvasRenderingContext::Context2d;
         }
     };
 
     // CanvasRenderingContext implementation
     ~OffscreenCanvasRenderingContext2D() override;
     ContextType getContextType() const override { return Context2d; }
     bool is2d() const override { return true; }
+    void setOffscreenCanvasGetContextResult(OffscreenRenderingContext&) final;
     void setIsHidden(bool) final { ASSERT_NOT_REACHED(); }
     void stop() final { ASSERT_NOT_REACHED(); }
     void setCanvasGetContextResult(RenderingContext&) final {}
     void clearRect(double x, double y, double width, double height) override { BaseRenderingContext2D::clearRect(x, y, width, height); }
 
     // BaseRenderingContext2D implementation
     bool originClean() const final;
     void setOriginTainted() final;
     bool wouldTaintOrigin(CanvasImageSource*, ScriptState*) final;
 
@@ skipping 29 matching lines @@
 
 private:
     bool m_hasAlpha;
     bool m_originClean = true;
     OwnPtr<ImageBuffer> m_imageBuffer;
 };
 
 } // namespace blink
 
 #endif // OffscreenCanvasRenderingContext2D_h