luci: Increase CQ experimental percentage to 40 for android-pie-arm64-rel

According to the device capacity http://shortn/_b0QLWXBn0o, there should
be enough devices to support 40% traffic.

Bug: 1111436
Change-Id: I38ceb9b54d151bfddbc83e640c8d0f25d981aa81
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2417102Reviewed-by: Ben Pastene <bpastene@chromium.org>
Commit-Queue: Haiyang Pan <hypan@google.com>
Cr-Commit-Position: refs/heads/master@{#808091}

infra/config/generated/commit-queue.cfg

@@ -279,7 +279,7 @@ config_groups {
       }
       builders {
         name: "chromium/try/android-pie-arm64-rel"
-        experiment_percentage: 20
+        experiment_percentage: 40
         location_regexp: ".*"
         location_regexp_exclude: ".+/[+]/docs/.+"
         location_regexp_exclude: ".+/[+]/infra/config/.+"

infra/config/generated/cq-builders.md

@@ -351,7 +351,7 @@ as required builders.
   * Experiment percentage: 5
 
 * [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: 20
+  * Experiment percentage: 40
 
 * [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

infra/config/subprojects/chromium/try.star

@@ -324,7 +324,7 @@ try_.chromium_android_builder(
     # TODO(crbug.com/1111436): Enable on CQ fully once the tests run fine.
     main_list_view = settings.main_list_view_name,
     tryjob = try_.job(
-        experiment_percentage = 20,
+        experiment_percentage = 40,
     ),
 )