Pages using MessagePorts should be PageCacheable, even if there are pending messages.
<rdar://problem/53837882>
Created attachment 375363 [details] Patch
Comment on attachment 375363 [details] Patch r=me
Comment on attachment 375363 [details] Patch Clearing flags on attachment: 375363 Committed r248148: <https://trac.webkit.org/changeset/248148>
All reviewed patches have been landed. Closing bug.