Disable failing media unittests on chromeos.

telemetry/telemetry/internal/actions/seek_unittest.py

Index: telemetry/telemetry/internal/actions/seek_unittest.py
diff --git a/telemetry/telemetry/internal/actions/seek_unittest.py b/telemetry/telemetry/internal/actions/seek_unittest.py
index 80b9689bc2f3a995ffde1cf262365e06407b611b..75b50f88fc058095ee2d0981ec07d769c5255c11 100644
--- a/telemetry/telemetry/internal/actions/seek_unittest.py
+++ b/telemetry/telemetry/internal/actions/seek_unittest.py
@@ -19,7 +19,7 @@ class SeekActionTest(tab_test_case.TabTestCase):
     tab_test_case.TabTestCase.setUp(self)
     self.Navigate('video_test.html')
 
-  @decorators.Disabled('linux')  # crbug.com/418577
+  @decorators.Disabled('linux', 'chromeos')  # crbug.com/749890
   def testSeekWithNoSelector(self):
     """Tests that with no selector Seek  action seeks first media element."""
     action = seek.SeekAction(seconds=1, timeout_in_seconds=5)
@@ -29,7 +29,7 @@ class SeekActionTest(tab_test_case.TabTestCase):
     self.assertTrue(self._tab.EvaluateJavaScript(VIDEO_1_SEEKED_CHECK))
     self.assertFalse(self._tab.EvaluateJavaScript(AUDIO_1_SEEKED_CHECK))
 
-  @decorators.Disabled('linux')  # crbug.com/418577
+  @decorators.Disabled('linux', 'chromeos')  # crbug.com/749890
   def testSeekWithVideoSelector(self):
     """Tests that Seek action seeks video element matching selector."""
     action = seek.SeekAction(seconds=1, selector='#video_1',
@@ -43,7 +43,7 @@ class SeekActionTest(tab_test_case.TabTestCase):
     self.assertTrue(self._tab.EvaluateJavaScript(VIDEO_1_SEEKED_CHECK))
     self.assertFalse(self._tab.EvaluateJavaScript(AUDIO_1_SEEKED_CHECK))
 
-  @decorators.Disabled('linux')  # crbug.com/418577
+  @decorators.Disabled('linux', 'chromeos')  # crbug.com/749890
   def testSeekWithAllSelector(self):
     """Tests that Seek action seeks all video elements with selector='all'."""
     action = seek.SeekAction(seconds=1, selector='all',
@@ -57,7 +57,7 @@ class SeekActionTest(tab_test_case.TabTestCase):
     self.assertTrue(self._tab.EvaluateJavaScript(VIDEO_1_SEEKED_CHECK))
     self.assertTrue(self._tab.EvaluateJavaScript(AUDIO_1_SEEKED_CHECK))
 
-  @decorators.Disabled('linux')  # crbug.com/418577
+  @decorators.Disabled('linux', 'chromeos')  # crbug.com/749890
   def testSeekWaitForSeekTimeout(self):
     """Tests that wait_for_seeked timeouts if video does not seek."""
     action = seek.SeekAction(seconds=1, selector='#video_1',