Otherwise the same drawing commands will be replayed back anytime the backend is checked for uncommitted drawing.
Created attachment 393269 [details] Patch
This patch lowers the failures of the command run-webkit-tests --debug --no-retry LayoutTests/canvas/ LayoutTests/fast/canvas --internal-feature RenderCanvasInGPUProcessEnabled from 100 to 68 (after the patch of https://bugs.webkit.org/show_bug.cgi?id=208876).
Comment on attachment 393269 [details] Patch Clearing flags on attachment: 393269 Committed r258311: <https://trac.webkit.org/changeset/258311>
All reviewed patches have been landed. Closing bug.
<rdar://problem/60355642>