Add an option to output baked angle git hash to angle_commit.h We can leverage the ${rolling_to} hash value that is available in skia auto roller and use it as the ANGLE_COMMIT_HASH for Android Builds. Skia roller script can set ${rolling_to} hash to an environment variable ANGLE_UPSTREAM_HASH. In commit_id.py, check that if environment variable ANGLE_UPSTREAM_HASH is available, output the environment var into angle_commit.h. Bug: b/348044346 Bug: skia:356444755 Change-Id: I5232e4026d8b02d3ba603af0018060edb487566e Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/5758427 Reviewed-by: Amirali Abdolrashidi <abdolrashidi@google.com> Commit-Queue: Yuxin Hu <yuxinhu@google.com> Reviewed-by: Roman Lavrov <romanl@google.com>