Increase android-pie-arm64-rel cq experiment to 10%.

Bug: 765833
Change-Id: Icdfcb22db832fd7b4b31c2efb02bf8ed89f7cf0e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1812090
Reviewed-by: Ben Pastene <bpastene@chromium.org>
Reviewed-by: Aaron Gable <agable@chromium.org>
Commit-Queue: Andrew Luo <aluo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#698158}

docs/infra/cq_builders.md

@@ -312,7 +312,7 @@ as required builders.
 
 * [android-pie-arm64-rel](https://ci.chromium.org/p/chromium/builders/luci.chromium.try/android-pie-arm64-rel) ([`commit-queue.cfg` entry](https://cs.chromium.org/search/?q=package:%5Echromium$+file:commit-queue.cfg+chromium/try/android-pie-arm64-rel)) ([matching builders](https://cs.chromium.org/search/?q=file:trybots.py+android-pie-arm64-rel))
 
-  * Experimental percentage: 2
+  * Experimental percentage: 10
 
 * [chromeos-kevin-experimental-rel](https://ci.chromium.org/p/chromium/builders/luci.chromium.try/chromeos-kevin-experimental-rel) ([`commit-queue.cfg` entry](https://cs.chromium.org/search/?q=package:%5Echromium$+file:commit-queue.cfg+chromium/try/chromeos-kevin-experimental-rel)) ([matching builders](https://cs.chromium.org/search/?q=file:trybots.py+chromeos-kevin-experimental-rel))
 

infra/config/commit-queue.cfg

@@ -363,7 +363,7 @@ config_groups {
 
       builders {
         name: "chromium/try/android-pie-arm64-rel"
-        experiment_percentage: 2
+        experiment_percentage: 10
       }
       builders {
         name: "chromium/try/chromeos-kevin-experimental-rel"