[dart] Send the got_revision from bot_update when publishing the results

This is needed so the try results can be analyzed, knowing the base commit
that the patch has been applied to.

This is a copy of the change in the chromium tree
https://chromium-review.googlesource.com/c/chromium/tools/build/+/2071868

Bug: https://github.com/dart-lang/dart_ci/issues/74
Change-Id: I65ed8bac167bd2322c2200cbc5ff0a72cb6cd253
Reviewed-on: https://dart-review.googlesource.com/c/recipes/+/137600
Reviewed-by: Alexander Thomas <athom@google.com>
7 files changed