ozone/x11: enable interactive_ui_tests.

This is the last test suite that can be enabled. Next test suites
can be enabled only after more resourcese are allocated.
See https://crbug.com/1125488 to track the status of that.

Bug: 1134495
Change-Id: I611def00a1967c615227d84563ee0fd0d8beb803
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2479165
Auto-Submit: Maksim Sisov (GMT+3) <msisov@igalia.com>
Commit-Queue: Scott Violet <sky@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#817969}

testing/buildbot/chromium.linux.json

@@ -5001,6 +5001,28 @@
         "test": "gpu_unittests",
         "test_id_prefix": "ninja://gpu:gpu_unittests/"
       },
+      {
+        "args": [
+          "--ozone-platform=x11",
+          "--enable-features=UseOzonePlatform"
+        ],
+        "merge": {
+          "args": [],
+          "script": "//testing/merge_scripts/standard_gtest_merge.py"
+        },
+        "name": "interactive_ui_tests_x11",
+        "swarming": {
+          "can_use_on_swarming_builders": true,
+          "dimension_sets": [
+            {
+              "os": "Ubuntu-16.04"
+            }
+          ],
+          "service_account": "chromium-tester@chops-service-accounts.iam.gserviceaccount.com"
+        },
+        "test": "interactive_ui_tests",
+        "test_id_prefix": "ninja://chrome/test:interactive_ui_tests/"
+      },
       {
         "args": [
           "--ozone-platform=x11",

testing/buildbot/test_suites.pyl

@@ -3465,6 +3465,7 @@
     },
 
     'linux_ozone_x11_only_gtests': {
+      'interactive_ui_tests': {},
       'ozone_x11_unittests': {},
       'x11_unittests': {},
     },