Capture/Replay: Use custom GL header. This will let us override the util loader for all new traces. It will also be easier to maintain going forward if we have to change the header again. The end goal is to run the trace tests with a custom GL layer that can intercept certain API calls. Bug: angleproject:4845 Change-Id: I028a1afdadf638998805d7b9a2cc6717cf5f0148 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2308029 Commit-Queue: Jamie Madill <jmadill@chromium.org> Reviewed-by: Cody Northrop <cnorthrop@google.com>