+ make media_blink_unittests build on mac

BUG=533335, 487300

Review URL: https://codereview.chromium.org/1358613002

Cr-Commit-Position: refs/heads/master@{#350387}
diff --git a/testing/buildbot/gn_isolate_map.pyl b/testing/buildbot/gn_isolate_map.pyl
index 1ca5a1b8..6017eea 100644
--- a/testing/buildbot/gn_isolate_map.pyl
+++ b/testing/buildbot/gn_isolate_map.pyl
@@ -244,6 +244,10 @@
     "label": "//media:media_unittests",
     "type": "windowed_test_launcher",
   },
+  "media_blink_unittests": {
+    "label": "//media/blink:media_blink_unittests",
+    "type": "windowed_test_launcher",
+  },
   "midi_unittests": {
     "label": "//media/midi:midi_unittests",
     "type": "windowed_test_launcher",