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 "bindings/core/v8/ScriptState.h"
 #include "core/html/canvas/CanvasContextCreationAttributes.h"
 #include "modules/canvas2d/BaseRenderingContext2D.h"
 #include "modules/offscreencanvas/OffscreenCanvasRenderingContext.h"
 #include "modules/offscreencanvas/OffscreenCanvasRenderingContextFactory.h"
 
 namespace blink {
 
-class MODULES_EXPORT OffscreenCanvasRenderingContext2D final : public OffscreenCanvasRenderingContext, public BaseRenderingContext2D {
+class MODULES_EXPORT OffscreenCanvasRenderingContext2D final : public GarbageCollectedFinalized<OffscreenCanvasRenderingContext2D>, public OffscreenCanvasRenderingContext, public BaseRenderingContext2D, public ScriptWrappable {

[xlai (Olivia), 2016/04/20 20:42:16]

Good change to move the ScriptWrappable. So now only the specific rendering
contexts (2d, webgl) are explicitly exposed in scripts, instead of staying in
generic renderingcontext class.

     DEFINE_WRAPPERTYPEINFO();
     USING_GARBAGE_COLLECTED_MIXIN(OffscreenCanvasRenderingContext2D);
 public:
     class Factory : public OffscreenCanvasRenderingContextFactory {
     public:
         Factory() {}
         ~Factory() override {}
 
-        OffscreenCanvasRenderingContext* create(OffscreenCanvas* canvas, const CanvasContextCreationAttributes& attrs) override
+        OffscreenCanvasRenderingContext* create(ScriptState* scriptState, OffscreenCanvas* canvas, const CanvasContextCreationAttributes& attrs) override
         {
             return new OffscreenCanvasRenderingContext2D(canvas, attrs);
         }
 
         OffscreenCanvasRenderingContext::ContextType getContextType() const override
         {
             return OffscreenCanvasRenderingContext::Context2d;
         }
 
         void onError(OffscreenCanvas* canvas, const String& error) override {}
     };
 
     // OffscreenCanvasRenderingContext implementation
     ~OffscreenCanvasRenderingContext2D() override;
-    ContextType getContextType() const override { return Context2d; }
+    ContextType getOffscreenCanvasRenderingContextType() const override { return Context2d; }
     bool is2d() const override { return true; }
+    void setOffscreenCanvasGetContextResult(OffscreenRenderingContext&) final;
 
     // BaseRenderingContext2D implementation
     bool originClean() const final;
     void setOriginTainted() final;
     bool wouldTaintOrigin(CanvasImageSource*) final;
 
     int width() const final;
     int height() const final;
 
     bool hasImageBuffer() const final;
@@ skipping 25 matching lines @@
 
 private:
     bool m_hasAlpha;
     bool m_originClean = true;
     OwnPtr<ImageBuffer> m_imageBuffer;
 };
 
 } // namespace blink
 
 #endif // OffscreenCanvasRenderingContext2D_h