arc: Limit min range for tracing tool.

This limits min range of values displayed as chart to avoid confusion
when minimal change causes chart to vary significantly.

TEST=Manually
BUG=b:/133148370

Change-Id: I09afc880fe17f65b4e89fff97b9f6a0d46e18364
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1618040
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Yury Khmel <khmel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#661453}
1 file changed