Add interactive_ui_tests to Win8 Aura config.

testing/buildbot/chromium.win.json

 {
   "Win 7 Tests x64 (1)": {
     "gtest_tests": [
       {
         "swarming": {
           "can_use_on_swarming_builders": true
         },
         "test": "accessibility_unittests"
       },
       {
@@ skipping 1674 matching lines @@
         },
         "test": "content_browsertests"
       },
       {
         "swarming": {
           "can_use_on_swarming_builders": true
         },
         "test": "events_unittests"
       },
       {
+        "test": "interactive_ui_tests"
+      },
+      {
         "test": "ipc_mojo_unittests"
       },
       {
         "test": "mojo_common_unittests"
       },
       {
         "test": "mojo_public_application_unittests"
       },
       {
         "test": "mojo_public_bindings_unittests"
@@ skipping 43 matching lines @@
       },
       {
         "swarming": {
           "can_use_on_swarming_builders": true
         },
         "test": "events_unittests"
       }
     ]
   }
 }