Disable failing media unittests on chromeos.

telemetry/telemetry/internal/actions/play_unittest.py

Index: telemetry/telemetry/internal/actions/play_unittest.py
diff --git a/telemetry/telemetry/internal/actions/play_unittest.py b/telemetry/telemetry/internal/actions/play_unittest.py
index c497cf9915c91335ad64bbb89b940ae241cc1a31..b73b06cf3b5e483cc202702c9c691d0668ad2bbc 100644
--- a/telemetry/telemetry/internal/actions/play_unittest.py
+++ b/telemetry/telemetry/internal/actions/play_unittest.py
@@ -20,7 +20,8 @@ class PlayActionTest(tab_test_case.TabTestCase):
     tab_test_case.TabTestCase.setUp(self)
     self.Navigate('video_test.html')
 
-  @decorators.Disabled('android', 'linux')  # crbug.com/418577
+  # crbug.com/749890
+  @decorators.Disabled('android', 'linux', 'chromeos')
   def testPlayWithNoSelector(self):
     """Tests that with no selector Play action plays first video element."""
     action = play.PlayAction(playing_event_timeout_in_seconds=5)
@@ -33,7 +34,8 @@ class PlayActionTest(tab_test_case.TabTestCase):
     self.assertTrue(self._tab.EvaluateJavaScript(VIDEO_1_PLAYING_CHECK))
     self.assertFalse(self._tab.EvaluateJavaScript(AUDIO_1_PLAYING_CHECK))
 
-  @decorators.Disabled('android', 'linux')  # crbug.com/418577
+  # crbug.com/749890
+  @decorators.Disabled('android', 'linux', 'chromeos')
   def testPlayWithVideoSelector(self):
     """Tests that Play action plays video element matching selector."""
     action = play.PlayAction(selector='#video_1',
@@ -47,7 +49,8 @@ class PlayActionTest(tab_test_case.TabTestCase):
     self.assertTrue(self._tab.EvaluateJavaScript(VIDEO_1_PLAYING_CHECK))
     self.assertFalse(self._tab.EvaluateJavaScript(AUDIO_1_PLAYING_CHECK))
 
-  @decorators.Disabled('android', 'linux')  # crbug.com/418577
+  # crbug.com/749890
+  @decorators.Disabled('android', 'linux', 'chromeos')
   def testPlayWithAllSelector(self):
     """Tests that Play action plays all video elements with selector='all'."""
     action = play.PlayAction(selector='all',
@@ -61,8 +64,7 @@ class PlayActionTest(tab_test_case.TabTestCase):
     self.assertTrue(self._tab.EvaluateJavaScript(VIDEO_1_PLAYING_CHECK))
     self.assertTrue(self._tab.EvaluateJavaScript(AUDIO_1_PLAYING_CHECK))
 
-  # http://crbug.com/273887
-  @decorators.Disabled('linux')  # crbug.com/418577
+  @decorators.Disabled('linux', 'chromeos')  # crbug.com/749890
   def testPlayWaitForPlayTimeout(self):
     """Tests that wait_for_playing timeouts if video does not play."""
     action = play.PlayAction(selector='#video_1',
@@ -72,7 +74,8 @@ class PlayActionTest(tab_test_case.TabTestCase):
     self.assertFalse(self._tab.EvaluateJavaScript(VIDEO_1_PLAYING_CHECK))
     self.assertRaises(py_utils.TimeoutException, action.RunAction, self._tab)
 
-  @decorators.Disabled('android', 'linux')  # crbug.com/418577
+  # crbug.com/749890
+  @decorators.Disabled('android', 'linux', 'chromeos')
   def testPlayWaitForEnded(self):
     """Tests that wait_for_ended waits for video to end."""
     action = play.PlayAction(selector='#video_1',
@@ -85,7 +88,7 @@ class PlayActionTest(tab_test_case.TabTestCase):
     # Assert video ended.
     self.assertTrue(self._tab.EvaluateJavaScript(VIDEO_1_ENDED_CHECK))
 
-  @decorators.Disabled('linux')  # crbug.com/418577
+  @decorators.Disabled('linux', 'chromeos')  # crbug.com/749890
   def testPlayWithoutWaitForEnded(self):
     """Tests that wait_for_ended waits for video to end."""
     action = play.PlayAction(selector='#video_1',
@@ -98,7 +101,7 @@ class PlayActionTest(tab_test_case.TabTestCase):
     # Assert video did not end.
     self.assertFalse(self._tab.EvaluateJavaScript(VIDEO_1_ENDED_CHECK))
 
-  @decorators.Disabled('linux')  # crbug.com/418577
+  @decorators.Disabled('linux', 'chromeos')  # crbug.com/749890
   def testPlayWaitForEndedTimeout(self):
     """Tests that action raises exception if timeout is reached."""
     action = play.PlayAction(selector='#video_1',