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I copied the existing win-10-perf shard map since
we don't have test runtime data for this yet. That
is also why I used only 26 shards for this for now.
We can add more shards in later.

TBR'ing John since I have Haiyang's non-committer review
and this change is low-risk (it only adds a new perf builder
and does not affect Chrome.)

TBR=johnchen@chromium.org

Bug: 998161
Change-Id: I98ab934614380bf5a9678f1765c7f67001a3c7af
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1979094Reviewed-by: Caleb Rouleau <crouleau@chromium.org>
Commit-Queue: Caleb Rouleau <crouleau@chromium.org>
Cr-Commit-Position: refs/heads/master@{#727014}