GPUProcess updated to handle multiple instances of GPUConnectionToWebProcess per web process, by storing both the primary connection (connected to the main thread of the web process), and a list of secondary connections (for workers).
<rdar://problem/102730981>
Pull request: https://github.com/WebKit/WebKit/pull/6879
Committed 257266@main (7ae4b48cc67a): <https://commits.webkit.org/257266@main> Reviewed commits have been landed. Closing PR #6879 and removing active labels.