Add vr_shell_unittests to ansr.

BUG=670147

Review-Url: https://codereview.chromium.org/2549393004
Cr-Commit-Position: refs/heads/master@{#442744}

testing/buildbot/chromium.android.json

@@ -1179,6 +1179,38 @@
           ]
         },
         "test": "unit_tests"
+      },
+      {
+        "override_isolate_target": "vr_shell_unittests",
+        "swarming": {
+          "can_use_on_swarming_builders": true,
+          "cipd_packages": [
+            {
+              "cipd_package": "infra/tools/luci/logdog/butler/${platform}",
+              "location": "bin",
+              "revision": "git_revision:3ff24775a900b675866fbcacf2a8f98a18b2a16a"
+            }
+          ],
+          "dimension_sets": [
+            {
+              "android_devices": "4",
+              "device_os": "MMB29Q",
+              "device_type": "bullhead"
+            }
+          ],
+          "hard_timeout": 960,
+          "output_links": [
+            {
+              "link": [
+                "https://luci-logdog.appspot.com/v/?s",
+                "=android%2Fswarming%2Flogcats%2F",
+                "${TASK_ID}%2F%2B%2Funified_logcats"
+              ],
+              "name": "shard #${SHARD_INDEX} logcats"
+            }
+          ]
+        },
+        "test": "vr_shell_unittests"
       }
     ],
     "isolated_scripts": [