Disable telemetry's testBattOrTracing on cros VM test bot.

TBR=jbudorick@chromium.org

Bug: 836447
Change-Id: Ief0cbfbfe135265115d46e777d7701fe9515d485
Reviewed-on: https://chromium-review.googlesource.com/1123113Reviewed-by: Ben Pastene <bpastene@chromium.org>
Reviewed-by: John Budorick <jbudorick@chromium.org>
Commit-Queue: Ben Pastene <bpastene@chromium.org>
Cr-Commit-Position: refs/heads/master@{#572010}

testing/buildbot/chromium.fyi.json

@@ -3254,6 +3254,7 @@
           "--browser=cros-chrome",
           "--remote=127.0.0.1",
           "--remote-ssh-port=9222",
+          "--skip=telemetry.core.tracing_controller_unittest.TracingControllerTest.testBattOrTracing",
           "--skip=telemetry.internal.app.android_app_unittest.AndroidAppTest.testWebView"
         ],
         "isolate_name": "telemetry_unittests",

testing/buildbot/test_suites.pyl

@@ -410,6 +410,9 @@
         # By default, CrOS VMs' ssh servers listen on local port 9222.
         '--remote=127.0.0.1',
         '--remote-ssh-port=9222',
+        # Flaky.
+        '--skip=telemetry.core.tracing_controller_unittest.TracingControllerTest.testBattOrTracing',
+        # Always fails.
         '--skip=telemetry.internal.app.android_app_unittest.AndroidAppTest.testWebView',
       ],
       'swarming': {