Bug 1528909 - cross-origin checks in CanvasRenderingContext2D::DrawImage, r=aosmond

Differential Revision: https://phabricator.services.mozilla.com/D20350

--HG--
extra : moz-landing-system : lando

dom/canvas/CanvasRenderingContext2D.cpp

@@ -5733,6 +5733,13 @@ bool CanvasRenderingContext2D::ShouldForceInactiveLayer(
   return !aManager->CanUseCanvasLayerForSize(GetSize());
 }
 
+void CanvasRenderingContext2D::SetWriteOnly() {
+  mWriteOnly = true;
+  if (mCanvasElement) {
+    mCanvasElement->SetWriteOnly();
+  }
+}
+
 NS_IMPL_CYCLE_COLLECTION_ROOT_NATIVE(CanvasPath, AddRef)
 NS_IMPL_CYCLE_COLLECTION_UNROOT_NATIVE(CanvasPath, Release)
 

dom/canvas/CanvasRenderingContext2D.h

@@ -1114,7 +1114,7 @@ class CanvasRenderingContext2D final : public nsICanvasRenderingContextInternal,
   friend class CanvasDrawObserver;
   friend class ImageBitmap;
 
-  void SetWriteOnly() { mWriteOnly = true; }
+  void SetWriteOnly();
 
   bool IsWriteOnly() const { return mWriteOnly; }