Disable unit tests that fail on cros.

tools/telemetry/telemetry/unittest/run_tests.py

Index: tools/telemetry/telemetry/unittest/run_tests.py
diff --git a/tools/telemetry/telemetry/unittest/run_tests.py b/tools/telemetry/telemetry/unittest/run_tests.py
index 85010839982c017c7caa48bd81ca0a672adcae6b..c4f2e216c8f592ecf3667f04075a1151666fecbc 100644
--- a/tools/telemetry/telemetry/unittest/run_tests.py
+++ b/tools/telemetry/telemetry/unittest/run_tests.py
@@ -7,6 +7,7 @@ import unittest
 from telemetry.core import browser_options
 from telemetry.core import discover
 from telemetry.core import util
+from telemetry.core.backends.chrome import cros_interface
 from telemetry.unittest import gtest_testrunner
 from telemetry.unittest import options_for_unittests
 
@@ -72,6 +73,9 @@ def DiscoverAndRunTests(
       if hasattr(method, '_disabled_test'):
         if not run_disabled_tests:
           return False
+      if (hasattr(method, '_disabled_test_on_cros') and
+          cros_interface.IsRunningOnCrosDevice()):
+        return False
 
     return True