Use a stable ordering when enumerating files. Output the enumerated files in sorted order when running enumerate_files.py from gyp, to prevent unnecessary buildfile churn that makes comparing revisions noisy. Change-Id: Ic644053d0a1cc9c986ae47fbe983221d6a62b50b Reviewed-on: https://chromium-review.googlesource.com/187690 Tested-by: Geoff Lang <geofflang@chromium.org> Reviewed-by: Shannon Woods <shannonwoods@chromium.org>