Implement OffscreenCanvas.getContext('webgl')

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

Index: third_party/WebKit/Source/modules/webgl/WebGLRenderingContext.h
diff --git a/third_party/WebKit/Source/modules/webgl/WebGLRenderingContext.h b/third_party/WebKit/Source/modules/webgl/WebGLRenderingContext.h
index 6c23f299fd15dba7aa3293daf61be08a3b0fb0e9..8c354e6d7b10d1e68cbe7ebfbdda05137608769b 100644
--- a/third_party/WebKit/Source/modules/webgl/WebGLRenderingContext.h
+++ b/third_party/WebKit/Source/modules/webgl/WebGLRenderingContext.h
@@ -27,6 +27,8 @@
 #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 {
@@ -47,19 +49,34 @@ public:
         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;