coverage: Copy test results if only one shard ran

This restores behavior which was removed in https://crrev.com/c/1526790.
That CL unintentionally broke builds, and followup CLs to that CL took
longer than expected to land.

Bug: 923711
Change-Id: I1649b39cf9c30a2fd37499986f0db3998d87956b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1583341
Auto-Submit: Stephen Martinis <martiniss@chromium.org>
Commit-Queue: Yuke Liao <liaoyuke@chromium.org>
Reviewed-by: Yuke Liao <liaoyuke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#654029}
1 file changed