Presubmit: Verify ANGLE_SH_VERSION update ... when ShaderLang.h or ShaderVars.h change. Bug: angleproject:7279 Change-Id: I01f6035ad41a4d92cc9e5d1e509731bb2ff29047 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/3823619 Reviewed-by: Roman Lavrov <romanl@google.com> Commit-Queue: Roman Lavrov <romanl@google.com> Auto-Submit: Shahbaz Youssefi <syoussefi@chromium.org>