These fixes are necessary for ANGLE to work on iOS. I made these while
updating ANGLE in WebKit. Unless we make an iOS bot, there will likely
be small fixes like this every time we roll ANGLE in WebKit.

Bug: angleproject:4613
Change-Id: Ia0ed432c82d0a43b9514c26ddb65c168c393d50d
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2551537
Commit-Queue: Kenneth Russell <kbr@chromium.org>
Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>
Reviewed-by: Kenneth Russell <kbr@chromium.org>