Change how multiple commit messages are split Instead of just splitting commit messages at Change-Id line, now commit messages will be split at the first blank line after a Change-Id line. Bug: angleproject:4715 Change-Id: I39d69662560fd67d1361f13e81362c9a1a7af3bd Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2279570 Commit-Queue: Manh Nguyen <nguyenmh@google.com> Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org> Reviewed-by: Jamie Madill <jmadill@chromium.org>