Running git cl try-results fetches the latest patchset which may be a trivial change, e.g. rebase or commit message change.
This change allows try-results to get the result of patchsets equivalent to the latest and returns their results.

Bug: 774179
Change-Id: Iec2fea102597773e24c2e887f19282f14c123e61
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/2532899Reviewed-by: Josip Sokcevic <sokcevic@google.com>
Commit-Queue: Gavin Mak <gavinmak@google.com>