Improve Error Messaging Improving error messaging for egl validations. Bug: b/186543601 Change-Id: Iec9a8f14998bc105785eca990f6512b72385191a Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/3124071 Reviewed-by: Ian Elliott <ianelliott@google.com> Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org> Reviewed-by: Jamie Madill <jmadill@chromium.org> Commit-Queue: Yuxin Hu <yuxinhu@google.com>