Determine if OffscreenCanvas is paintable in different rendering contexts

third_party/WebKit/Source/core/offscreencanvas/OffscreenCanvas.h

 // Copyright 2015 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 OffscreenCanvas_h
 #define OffscreenCanvas_h
 
 #include "bindings/core/v8/ScriptPromise.h"
 #include "bindings/core/v8/ScriptState.h"
 #include "bindings/core/v8/ScriptWrappable.h"
@@ skipping 58 matching lines @@
     static CanvasRenderingContextFactory* getRenderingContextFactory(int);
 
     Member<CanvasRenderingContext> m_context;
     int m_canvasId = -1; // DOMNodeIds starts from 0, using -1 to indicate no associated canvas element.
     IntSize m_size;
     bool m_isNeutered = false;
 
     bool m_originClean;
     bool m_disableReadingFromCanvas = false;
 
+    bool isPaintable() const;
+
     // cc::SurfaceId is broken into three integer components as this can be used
     // in transfer of OffscreenCanvas across threads
     // If this object is not created via HTMLCanvasElement.transferControlToOffscreen(),
     // then the following members would remain as initialized zero values.
     uint32_t m_clientId = 0;
     uint32_t m_localId = 0;
     uint64_t m_nonce = 0;
 };
 
 } // namespace blink
 
 #endif // OffscreenCanvas_h