MB: Add support for isolating scripts + isolate low_bandwidth_audio_test.py.

NOTRY=True

Bug: chromium:755660
Change-Id: I92de99cd1e3dd206f6cd366dbfd1c8c211d37cc7
Reviewed-on: https://webrtc-review.googlesource.com/4420
Commit-Queue: Edward Lemur <ehmaldonado@webrtc.org>
Reviewed-by: Henrik Kjellander <kjellander@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#20089}
diff --git a/tools_webrtc/mb/gn_isolate_map.pyl b/tools_webrtc/mb/gn_isolate_map.pyl
index 09314a9..33544bc 100644
--- a/tools_webrtc/mb/gn_isolate_map.pyl
+++ b/tools_webrtc/mb/gn_isolate_map.pyl
@@ -62,6 +62,14 @@
       "--quick",
     ],
   },
+  "low_bandwidth_audio_perf_test": {
+    "label": "//audio:low_bandwidth_audio_test",
+    "type": "script",
+    "script": "//audio/test/low_bandwidth_audio_test.py",
+    "args": [
+      ".", "--remove",
+    ],
+  },
   "modules_tests": {
     "label": "//modules:modules_tests",
     "type": "console_test_launcher",