dc4f2db4cf
Enforces the inclusion of the standard copyright and BSD-style license header with the current year at the top of newly created Dart files. TAG=agy CONV=03fa0bca-5bc4-4526-8592-707d62f64410 Change-Id: I0b4a085e3f2d69a3459dee84336f0be36499e4cb Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/509440 Reviewed-by: Kevin Moore <kevmoo@google.com> Commit-Queue: Nate Biggs <natebiggs@google.com>