Bump 10% of real android_arm64_dbg_recipe tryjobs to luci.

Bug: 731962
Change-Id: I6a77909f45f14762ec94ced476c66999b02878f7
Reviewed-on: https://chromium-review.googlesource.com/990195Reviewed-by: John Budorick <jbudorick@chromium.org>
Commit-Queue: Benjamin Pastene <bpastene@chromium.org>
Cr-Commit-Position: refs/heads/master@{#547466}

infra/config/branch/cq.cfg

@@ -40,7 +40,7 @@ verifiers {
       name: "master.tryserver.chromium.android"
       builders {
         name: "android_arm64_dbg_recipe"
-        equivalent_to { bucket: "luci.chromium.try" percentage: 0 }
+        equivalent_to { bucket: "luci.chromium.try" percentage: 10 }
       }
       builders {
         name: "android_clang_dbg_recipe"