telemetry: Disable two CLIHelpersTest.

These are also failing on the informational trybots.

Test: none
Bug: 938575
Change-Id: I3d59cccf5546b5512e837a27b9829c48402d603f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1504704Reviewed-by: Caleb Rouleau <crouleau@chromium.org>
Commit-Queue: Sammie Quon <sammiequon@chromium.org>
Cr-Commit-Position: refs/heads/master@{#637957}

tools/perf/core/cli_helpers_unittest.py

@@ -63,6 +63,8 @@ class CLIHelpersTest(unittest.TestCase):
 
   @mock.patch('__builtin__.print')
   @mock.patch('__builtin__.raw_input')
+  # https://crbug.com/938575.
+  @decorators.Disabled('chromeos')
   def testAskWithCustomAnswersAndDefault(self, raw_input_mock, print_mock):
     raw_input_mock.side_effect = ['']
     self.assertFalse(
@@ -72,6 +74,8 @@ class CLIHelpersTest(unittest.TestCase):
 
   @mock.patch('__builtin__.print')
   @mock.patch('__builtin__.raw_input')
+  # https://crbug.com/938575.
+  @decorators.Disabled('chromeos')
   def testAskNoDefaultCustomAnswersAsList(self, raw_input_mock, print_mock):
     raw_input_mock.side_effect = ['', 'FoO']
     self.assertEqual(cli_helpers.Ask('Ready?', ['foo', 'bar']), 'foo')