Determine if OffscreenCanvas is paintable in different rendering contexts

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

 /*
  * Copyright (C) 2009 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 398 matching lines @@
         Member<WebGLTexture> m_texture2DArrayBinding;
 
         DECLARE_TRACE();
     };
 
     void setFilterQuality(SkFilterQuality) override;
     bool isWebGL2OrHigher() { return version() >= 2; }
 
     void getHTMLOrOffscreenCanvas(HTMLCanvasElementOrOffscreenCanvas&) const;
 
+    DrawingBuffer* drawingBuffer() const;
+
 protected:
     friend class EXTDisjointTimerQuery;
     friend class WebGLDrawBuffers;
     friend class WebGLFramebuffer;
     friend class WebGLObject;
     friend class WebGLContextObject;
     friend class OESVertexArrayObject;
     friend class WebGLDebugShaders;
     friend class WebGLCompressedTextureASTC;
     friend class WebGLCompressedTextureATC;
@@ skipping 50 matching lines @@
     // Restore the client unpack parameters.
     virtual void restoreUnpackParameters();
 
     PassRefPtr<Image> drawImageIntoBuffer(PassRefPtr<Image>, int width, int height, const char* functionName);
 
     PassRefPtr<Image> videoFrameToImage(HTMLVideoElement*);
 
     // Structure for rendering to a DrawingBuffer, instead of directly
     // to the back-buffer of m_context.
     RefPtr<DrawingBuffer> m_drawingBuffer;
-    DrawingBuffer* drawingBuffer() const;
 
     RefPtr<WebGLContextGroup> m_contextGroup;
 
     bool m_isHidden;
     LostContextMode m_contextLostMode;
     AutoRecoveryMethod m_autoRecoveryMethod;
     // Dispatches a context lost event once it is determined that one is needed.
     // This is used for synthetic, WEBGL_lose_context and real context losses. For real ones, it's
     // likely that there's no JavaScript on the stack, but that might be dependent
     // on how exactly the platform discovers that the context was lost. For better
@@ skipping 619 matching lines @@
     const unsigned m_version;
 };
 
 DEFINE_TYPE_CASTS(WebGLRenderingContextBase, CanvasRenderingContext, context, context->is3d(), context.is3d());
 
 } // namespace blink
 
 WTF_ALLOW_MOVE_INIT_AND_COMPARE_WITH_MEM_FUNCTIONS(blink::WebGLRenderingContextBase::TextureUnitState);
 
 #endif // WebGLRenderingContextBase_h