Bug 1712855 - Fix assertion when recording SVG image blobs with non-integer translation transforms. r=jrmuizel

When we rasterized SVG images on the main thread of the content process,
we would call gfxUtils::DrawPixelSnapped with aUseOptimalFillOp set to
false. We should do the same when recording them.

Differential Revision: https://phabricator.services.mozilla.com/D116398

image/SourceSurfaceBlobImage.cpp

@@ -213,7 +213,7 @@ Maybe<BlobImageKeyData> SourceSurfaceBlobImage::RecordDrawing(
 
     gfxUtils::DrawPixelSnapped(ctx, svgDrawable, SizeDouble(mSize), region,
                                SurfaceFormat::OS_RGBA, SamplingFilter::POINT,
-                               mImageFlags);
+                               mImageFlags, /* aUseOptimalFillOp */ false);
   }
 
   recorder->FlushItem(imageRectOrigin);