luci: Ramp linux-ozone-rel to 10%.

Bug: 731426,826895
Change-Id: Ice68f17dae6cb0bacc923fc1a5c2d3dd130584d5
Reviewed-on: https://chromium-review.googlesource.com/1038807Reviewed-by: Andrii Shyshkalov <tandrii@chromium.org>
Commit-Queue: John Budorick <jbudorick@chromium.org>
Cr-Commit-Position: refs/heads/master@{#555437}

infra/config/branch/cq.cfg

@@ -98,7 +98,7 @@ verifiers {
       }
       builders {
         name: "linux_chromium_ozone_compile_only_ng"
-        equivalent_to { bucket: "luci.chromium.try" percentage: 0 }
+        equivalent_to { bucket: "luci.chromium.try" builder: "linux-ozone-rel" percentage: 10 }
       }
       builders {
         name: "linux_chromium_headless_rel"