Originally authored in the WebKit repository:
https://bugs.webkit.org/show_bug.cgi?id=205618

Has been tested with WebKit's WebGL backend on top of ANGLE inside the
iOS Simulator. TODOs will be addressed in forthcoming CLs.

Bug: angleproject:4263
Change-Id: Ic879866aaee5f933599d956b0646d0c01db55d0d
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1995824Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>
Reviewed-by: Jonah Ryan-Davis <jonahr@google.com>
Commit-Queue: Kenneth Russell <kbr@chromium.org>