[GPU Process] Simplify DisplayList::Iterator part 4: Move DisplayList::Iterator to its own .h/.cpp files
Created attachment 425085 [details] Patch
Created attachment 425086 [details] Patch
<rdar://problem/76488936>
Created attachment 425802 [details] Patch for committing
Created attachment 425828 [details] Patch for committing
Committed r275925 (236487@main): <https://commits.webkit.org/236487@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 425828 [details].