emulator: Increase CQ experimental percentage to 5 from 2 for MM

From the monitoring data, the pool is capable for higher traffic.

Bug: 997376
Change-Id: I557a7de4b7eed461b31941661c56265004263cb7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2340187
Auto-Submit: Haiyang Pan <hypan@google.com>
Reviewed-by: Erik Staab <estaab@chromium.org>
Commit-Queue: Erik Staab <estaab@chromium.org>
Cr-Commit-Position: refs/heads/master@{#795553}

infra/config/generated/commit-queue.cfg

@@ -211,7 +211,7 @@ config_groups {
       }
       builders {
         name: "chromium/try/android-marshmallow-x86-rel"
-        experiment_percentage: 2
+        experiment_percentage: 5
         location_regexp: ".*"
         location_regexp_exclude: "infra/config/.+"
       }

infra/config/generated/cq-builders.md

@@ -344,7 +344,7 @@ by CQ. These are often used to test new configurations before they are added
 as required builders.
 
 * [android-marshmallow-x86-rel](https://ci.chromium.org/p/chromium/builders/try/android-marshmallow-x86-rel) ([definition](https://cs.chromium.org/search?q=package:%5Echromium$+file:/cq.star$+-file:/beta/+-file:/stable/+android-marshmallow-x86-rel)) ([matching builders](https://cs.chromium.org/search?q=+file:trybots.py+android-marshmallow-x86-rel))
-  * Experiment percentage: 2
+  * Experiment percentage: 5
 
 * [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

@@ -128,7 +128,7 @@ try_.chromium_android_builder(
     name = "android-marshmallow-x86-rel",
     goma_jobs = goma.jobs.J150,
     tryjob = try_.job(
-        experiment_percentage = 2,
+        experiment_percentage = 5,
     ),
 )