Link to one of the failing runs:
https://build.chromium.org/p/chromium.android.fyi/builders/Nougat%20Phone%20Tester/builds/3951

Link to log output:
https://luci-logdog.appspot.com/v/?s=chromium%2Fbb%2Fchromium.android.fyi%2FNougat_Phone_Tester%2F3951%2F%2B%2Frecipes%2Fsteps%2Fchrome_public_test_apk_on_Android%2F0%2Flogs%2Forg.chromium.chrome.browser.tabmodel.UndoTabModelTest_testOpenRecentlyClosedTabMultiWindow%2F0


Failure output:


java.lang.RuntimeException: Error occurred waiting for callable
	at org.chromium.base.ThreadUtils.runOnUiThreadBlockingNoException(ThreadUtils.java:98)
	at org.chromium.content.browser.test.util.CriteriaHelper$2.isSatisfied(CriteriaHelper.java:120)
	at org.chromium.content.browser.test.util.CriteriaHelper.pollInstrumentationThread(CriteriaHelper.java:68)
	at org.chromium.content.browser.test.util.CriteriaHelper.pollUiThread(CriteriaHelper.java:117)
	at org.chromium.content.browser.test.util.CriteriaHelper.pollUiThread(CriteriaHelper.java:138)
	at org.chromium.chrome.browser.tabmodel.UndoTabModelTest.testOpenRecentlyClosedTabMultiWindow(UndoTabModelTest.java:1581)
	at java.lang.reflect.Method.invoke(Native Method)
	at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:52)
	at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
	at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
	at org.chromium.base.test.ScreenshotOnFailureStatement.evaluate(ScreenshotOnFailureStatement.java:37)
	at org.chromium.chrome.test.ChromeActivityTestRule$1.evaluate(ChromeActivityTestRule.java:65)
	at android.support.test.internal.statement.UiThreadStatement.evaluate(UiThreadStatement.java:55)
	at android.support.test.rule.ActivityTestRule$ActivityStatement.evaluate(ActivityTestRule.java:270)
	at org.junit.rules.RunRules.evaluate(RunRules.java:20)
	at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
	at org.chromium.base.test.BaseJUnit4ClassRunner.runChild(BaseJUnit4ClassRunner.java:184)
	at org.chromium.base.test.BaseJUnit4ClassRunner.runChild(BaseJUnit4ClassRunner.java:41)
	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
	at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
	at org.chromium.base.test.BaseJUnit4ClassRunner.run(BaseJUnit4ClassRunner.java:166)
	at org.junit.runners.Suite.runChild(Suite.java:128)
	at org.junit.runners.Suite.runChild(Suite.java:27)
	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
	at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
	at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
	at org.junit.runner.JUnitCore.run(JUnitCore.java:115)
	at android.support.test.internal.runner.TestExecutor.execute(TestExecutor.java:59)
	at android.support.test.runner.AndroidJUnitRunner.onStart(AndroidJUnitRunner.java:262)
	at org.chromium.base.test.BaseChromiumAndroidJUnitRunner.onStart(BaseChromiumAndroidJUnitRunner.java:100)
	at android.app.Instrumentation$InstrumentationThread.run(Instrumentation.java:1932)
Caused by: java.util.concurrent.ExecutionException: java.lang.IllegalStateException: Attempting to access TabModelSelector before initialization
	at java.util.concurrent.FutureTask.report(FutureTask.java:94)
	at java.util.concurrent.FutureTask.get(FutureTask.java:164)
	at org.chromium.base.ThreadUtils.runOnUiThreadBlocking(ThreadUtils.java:114)
	at org.chromium.base.ThreadUtils.runOnUiThreadBlockingNoException(ThreadUtils.java:96)
	... 41 more
Caused by: java.lang.IllegalStateException: Attempting to access TabModelSelector before initialization
	at org.chromium.chrome.browser.ChromeActivity.getTabModelSelector(ChromeActivity.java:1491)
	at org.chromium.chrome.browser.tabmodel.UndoTabModelTest$17.isSatisfied(UndoTabModelTest.java:1584)
	at org.chromium.content.browser.test.util.CriteriaHelper$1.call(CriteriaHelper.java:113)
	at org.chromium.content.browser.test.util.CriteriaHelper$1.call(CriteriaHelper.java:110)
	at java.util.concurrent.FutureTask.run(FutureTask.java:237)
	at android.os.Handler.handleCallback(Handler.java:751)
	at android.os.Handler.dispatchMessage(Handler.java:95)
	at android.os.Looper.loop(Looper.java:154)
	at android.app.ActivityThread.main(ActivityThread.java:6077)
	at java.lang.reflect.Method.invoke(Native Method)
	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:865)
	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755)