Dry-run chrome_public_smoke_test on MM-x86-rel

If it runs fine, it will be removed from MM-arm64-rel & MM-x86-rel-non-cq,
and run on MM-x86-rel formally.

Bug: 1127110
Change-Id: I55bdfece736a2ce00864be4b42e2ee1df1a6b777
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2552676Reviewed-by: Ben Pastene <bpastene@chromium.org>
Commit-Queue: Haiyang Pan <hypan@google.com>
Cr-Commit-Position: refs/heads/master@{#829868}

testing/buildbot/chromium.android.json

@@ -30035,6 +30035,66 @@
   },
   "android-marshmallow-x86-rel": {
     "gtest_tests": [
+      {
+        "args": [
+          "--gs-results-bucket=chromium-result-details",
+          "--recover-devices",
+          "--avd-config=../../tools/android/avd/proto/generic_android23.textpb"
+        ],
+        "experiment_percentage": 100,
+        "merge": {
+          "args": [
+            "--bucket",
+            "chromium-result-details",
+            "--test-name",
+            "chrome_public_smoke_test"
+          ],
+          "script": "//build/android/pylib/results/presentation/test_results_presentation.py"
+        },
+        "swarming": {
+          "can_use_on_swarming_builders": true,
+          "cipd_packages": [
+            {
+              "cipd_package": "infra/tools/luci/logdog/butler/${platform}",
+              "location": "bin",
+              "revision": "git_revision:ff387eadf445b24c935f1cf7d6ddd279f8a6b04c"
+            }
+          ],
+          "dimension_sets": [
+            {
+              "cpu": "x86-64",
+              "device_os": null,
+              "device_type": null,
+              "machine_type": "n1-standard-4",
+              "os": "Ubuntu-16.04",
+              "pool": "chromium.tests.avd"
+            }
+          ],
+          "named_caches": [
+            {
+              "name": "avd_generic_android23",
+              "path": ".android"
+            },
+            {
+              "name": "system_images_android_23_google_apis_x86",
+              "path": ".emulator_sdk"
+            }
+          ],
+          "output_links": [
+            {
+              "link": [
+                "https://luci-logdog.appspot.com/v/?s",
+                "=android%2Fswarming%2Flogcats%2F",
+                "${TASK_ID}%2F%2B%2Funified_logcats"
+              ],
+              "name": "shard #${SHARD_INDEX} logcats"
+            }
+          ],
+          "service_account": "chromium-tester@chops-service-accounts.iam.gserviceaccount.com"
+        },
+        "test": "chrome_public_smoke_test",
+        "test_id_prefix": "ninja://chrome/android:chrome_public_smoke_test/"
+      },
       {
         "args": [
           "--gs-results-bucket=chromium-result-details",

testing/buildbot/test_suite_exceptions.pyl

@@ -740,6 +740,11 @@
     'remove_from': [
       'android-code-coverage-native', # https://crbug.com/1018780
     ],
+    'modifications': {
+      'android-marshmallow-x86-rel': {
+        'experiment_percentage': 100, # crbug.com/1127110
+      },
+    },
   },
   'chrome_public_test_apk': {
     'remove_from': [

testing/buildbot/test_suites.pyl

@@ -103,6 +103,7 @@
     # Test suites will be gradually moved from android_marshmallow_wpr_gtests
     # to this one, when there are more GCE capacity.
     'android_marshmallow_emulator_gtests': {
+      'chrome_public_smoke_test': {},
       'unit_tests': {
         'android_swarming': {
           'shards': 2,