Add reporter to shared worker, which doesn't change the
behaviour as COEP is not currently handed to the
URLLoaderFactory.

Bug: 1060832
Change-Id: I4a4b55acd2bcdebef3ab20d741acdc1d188ac719
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2944788
Commit-Queue: Yifan Luo <[email protected]>
Reviewed-by: Camille Lamy <[email protected]>
Reviewed-by: Yutaka Hirano <[email protected]>
Cr-Commit-Position: refs/heads/master@{#903576}