Mark android-pie-arm64-rel 100% experimental to test lab cooling.

Bug: 1021665
Change-Id: I4d0b51afd0134fc4b2413a6e9463745352d2b816
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2038032
Auto-Submit: Andrew Luo <aluo@chromium.org>
Commit-Queue: John Budorick <jbudorick@chromium.org>
Reviewed-by: John Budorick <jbudorick@chromium.org>
Cr-Commit-Position: refs/heads/master@{#741533}

infra/config/buckets/try.star

@@ -181,6 +181,9 @@ try_.chromium_android_builder(
     cores = 16,
     goma_jobs = goma.jobs.J300,
     ssd = True,
+    tryjob = try_.job(
+        experiment_percentage = 100,
+    ),
 )
 
 try_.chromium_android_builder(

infra/config/generated/commit-queue.cfg

@@ -150,7 +150,7 @@ config_groups: <
       >
       builders: <
         name: "chromium/try/android-pie-arm64-rel"
-        includable_only: true
+        experiment_percentage: 100
       >
       builders: <
         name: "chromium/try/android-pie-x86-fyi-rel"

infra/config/generated/cq-builders.md

@@ -329,6 +329,9 @@ These builders are run on some percentage of builds. Their results are ignored
 by CQ. These are often used to test new configurations before they are added
 as required builders.
 
+* [android-pie-arm64-rel](https://ci.chromium.org/p/chromium/builders/try/android-pie-arm64-rel) ([definition](https://cs.chromium.org/search?q=package:%5Echromium$+file:/cq.star$+-file:/beta/+-file:/stable/+android-pie-arm64-rel)) ([matching builders](https://cs.chromium.org/search?q=+file:trybots.py+android-pie-arm64-rel))
+  * Experiment percentage: 100
+
 * [fuchsia-compile-x64-dbg](https://ci.chromium.org/p/chromium/builders/try/fuchsia-compile-x64-dbg) ([definition](https://cs.chromium.org/search?q=package:%5Echromium$+file:/cq.star$+-file:/beta/+-file:/stable/+fuchsia-compile-x64-dbg)) ([matching builders](https://cs.chromium.org/search?q=+file:trybots.py+fuchsia-compile-x64-dbg))
   * Experiment percentage: 50