chrome_public_test_apk failing on chromium.android/Lollipop Phone Tester

Builders failed on: 
- Lollipop Phone Tester: 
  https://build.chromium.org/p/chromium.android/builders/Lollipop%20Phone%20Tester

org.chromium.chrome.browser.VideoFullscreenOrientationLockChromeTest#testUnlockWithDownloadViewerActivity (run #1):
junit.framework.AssertionFailedError: Values did not match. Expected: false, actual: true
	at org.chromium.content.browser.test.util.CriteriaHelper.pollInstrumentationThread(CriteriaHelper.java:79)
	at org.chromium.content.browser.test.util.CriteriaHelper.pollInstrumentationThread(CriteriaHelper.java:94)
	at org.chromium.chrome.browser.VideoFullscreenOrientationLockChromeTest.waitForContentsFullscreenState(VideoFullscreenOrientationLockChromeTest.java:46)
	at org.chromium.chrome.browser.VideoFullscreenOrientationLockChromeTest.testUnlockWithDownloadViewerActivity(VideoFullscreenOrientationLockChromeTest.java:127)
	at android.test.InstrumentationTestCase.runMethod(InstrumentationTestCase.java:214)
	at android.test.InstrumentationTestCase.runTest(InstrumentationTestCase.java:199)
	at android.test.ActivityInstrumentationTestCase2.runTest(ActivityInstrumentationTestCase2.java:192)
	at org.chromium.chrome.test.ChromeActivityTestCaseBase.runTest(ChromeActivityTestCaseBase.java:758)
	at org.chromium.base.test.BaseTestResult.runParameterized(BaseTestResult.java:161)
	at org.chromium.base.test.BaseTestResult.run(BaseTestResult.java:124)
	at android.test.AndroidTestRunner.runTest(AndroidTestRunner.java:191)
	at android.test.AndroidTestRunner.runTest(AndroidTestRunner.java:176)
	at android.test.InstrumentationTestRunner.onStart(InstrumentationTestRunner.java:555)
	at android.app.Instrumentation$InstrumentationThread.run(Instrumentation.java:1853)


It's been flaky on Lollipop and N5x swarm:

https://test-results.appspot.com/dashboards/flakiness_dashboard.html#tests=org.chromium.chrome.browser.VideoFullscreenOrientationLockChromeTest%23testUnlockWithDownloadViewerActivity&testType=chrome_public_test_apk