The current implementation is too complex and prone to deadlocks.
branch up for testing: https://github.com/philn/WebKit/tree/img-decoder-harness
Pull request: https://github.com/WebKit/WebKit/pull/8971
Committed 259430@main (fa3503d135d0): <https://commits.webkit.org/259430@main> Reviewed commits have been landed. Closing PR #8971 and removing active labels.
<rdar://problem/104698598>