Adds views_aura_mus_unittests to the chromeos ozone bot

testing/buildbot/chromium.chromiumos.json

 {
   "Linux ChromiumOS Builder": {
     "additional_compile_targets": [
       "All"
     ]
   },
   "Linux ChromiumOS Ozone Tests (1)": {
     "gtest_tests": [
       {
         "swarming": {
@@ skipping 364 matching lines @@
         },
         "test": "url_unittests"
       },
       {
         "args": [
           "--override-use-gl-with-osmesa-for-tests"
         ],
         "swarming": {
           "can_use_on_swarming_builders": false
         },
+        "test": "views_aura_mus_unittests"
+      },
+      {
+        "args": [
+          "--override-use-gl-with-osmesa-for-tests"
+        ],
+        "swarming": {
+          "can_use_on_swarming_builders": false
+        },
         "test": "views_mus_interactive_ui_tests"
       },
       {
         "args": [
           "--override-use-gl-with-osmesa-for-tests"
         ],
         "swarming": {
           "can_use_on_swarming_builders": false
         },
         "test": "views_mus_unittests"
@@ skipping 736 matching lines @@
       },
       {
         "swarming": {
           "can_use_on_swarming_builders": true
         },
         "test": "wm_unittests"
       }
     ]
   }
 }