Run Mus Demo and WS tests on Ozone Linux bot

testing/buildbot/chromium.fyi.json

 {
   "Android Asan Builder Tests (dbg)": {
     "gtest_tests": [
       {
         "args": [
           "--tool=asan"
         ],
         "swarming": {
           "can_use_on_swarming_builders": false
         },
@@ skipping 11404 matching lines @@
         "test": "mus_ws_unittests"
       },
       {
         "swarming": {
           "can_use_on_swarming_builders": false
         },
         "test": "views_mus_interactive_ui_tests"
       }
     ]
   },
+  "Ozone Linux": {
+    "gtest_tests": [
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
+        "test": "mus_demo_unittests"
+      },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
+        "test": "mus_ws_unittests"
+      }
+    ]
+  },
   "Site Isolation Android": {
     "gtest_tests": [
       {
         "override_isolate_target": "content_browsertests",
         "swarming": {
           "can_use_on_swarming_builders": true,
           "dimension_sets": [
             {
               "android_devices": "4",
               "device_type": "bullhead"
@@ skipping 1315 matching lines @@
       },
       {
         "swarming": {
           "can_use_on_swarming_builders": false
         },
         "test": "views_unittests"
       }
     ]
   }
 }