Add WorkerSettings to expose certain flag values in WorkerGlobalScope

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"
 #include <memory>
 
 namespace blink {
 
 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(ScriptState* scriptState, OffscreenCanvas* canvas, const CanvasContextCreationAttributes& attrs) override
         {
-            return new OffscreenCanvasRenderingContext2D(canvas, attrs);
+            return new OffscreenCanvasRenderingContext2D(scriptState, canvas, attrs);
         }
 
         CanvasRenderingContext::ContextType getContextType() const override
         {
             return CanvasRenderingContext::Context2d;
         }
     };
 
     // CanvasRenderingContext implementation
     ~OffscreenCanvasRenderingContext2D() override;
@@ skipping 30 matching lines @@
     void snapshotStateForFilter() final { }
 
     void validateStateStack() final;
 
     bool hasAlpha() const override { return m_hasAlpha; }
     bool isContextLost() const override;
 
     ImageBitmap* transferToImageBitmap(ExceptionState&) final;
 
 protected:
-    OffscreenCanvasRenderingContext2D(OffscreenCanvas*, const CanvasContextCreationAttributes& attrs);
+    OffscreenCanvasRenderingContext2D(ScriptState*, OffscreenCanvas*, const CanvasContextCreationAttributes& attrs);
     DECLARE_VIRTUAL_TRACE();
 
 private:
     bool m_hasAlpha;
     bool m_needsMatrixClipRestore = false;
     std::unique_ptr<ImageBuffer> m_imageBuffer;
+    bool m_disableReadingFromCanvas;
 };
 
 } // namespace blink
 
 #endif // OffscreenCanvasRenderingContext2D_h