Run app_list_unittests on Swarming in more configurations.

testing/buildbot/chromium.chromiumos.json

Index: testing/buildbot/chromium.chromiumos.json
diff --git a/testing/buildbot/chromium.chromiumos.json b/testing/buildbot/chromium.chromiumos.json
index a802b831942521c8497327735c5915c8c5d88967..539bbd845b66fe99744b319db4bf69006450d5e7 100644
--- a/testing/buildbot/chromium.chromiumos.json
+++ b/testing/buildbot/chromium.chromiumos.json
@@ -8,6 +8,9 @@
         "test": "accessibility_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "app_list_unittests"
       },
       {
@@ -173,6 +176,9 @@
         "test": "accessibility_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "app_list_unittests"
       },
       {
@@ -352,6 +358,9 @@
         "test": "accessibility_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "app_list_unittests"
       },
       {