1 files changed, 14 insertions, 0 deletions
diff --git a/dom/canvas/CanvasRenderingContext2D.h b/dom/canvas/CanvasRenderingContext2D.h
index 848b3ee08..46758ec88 100644
--- a/dom/canvas/CanvasRenderingContext2D.h
+++ b/dom/canvas/CanvasRenderingContext2D.h
@@ -40,6 +40,7 @@ class SourceSurface;
 namespace dom {
 class HTMLImageElementOrSVGImageElementOrHTMLCanvasElementOrHTMLVideoElementOrImageBitmap;
 typedef HTMLImageElementOrSVGImageElementOrHTMLCanvasElementOrHTMLVideoElementOrImageBitmap CanvasImageSource;
+class ImageBitmap;
 class ImageData;
 class StringOrCanvasGradientOrCanvasPattern;
 class OwningStringOrCanvasGradientOrCanvasPattern;
@@ -1151,6 +1152,19 @@ protected:
 
   friend struct CanvasBidiProcessor;
   friend class CanvasDrawObserver;
+  friend class ImageBitmap;
+
+  // For the origin-clean algorithm (mWriteOnly == !origin-clean)
+  // See https://html.spec.whatwg.org/multipage/imagebitmap-and-animations.html
+  void SetWriteOnly() {
+    mWriteOnly = true;
+  }
+
+  bool IsWriteOnly() const {
+    return mWriteOnly;
+  }
+
+  bool mWriteOnly;
 };
 
 } // namespace dom