https://build.chromium.org/p/chromium.android/builders/Jelly%20Bean%20Tester/builds/6072/steps/chrome_public_test_apk/logs/stdio

I 1557.241s run_tests_on_device(02740f1a0b59aab6)    java.util.concurrent.TimeoutException: waitForCallback timed out!
I 1557.241s run_tests_on_device(02740f1a0b59aab6)    	at org.chromium.content.browser.test.util.CallbackHelper.waitForCallback(CallbackHelper.java:184)
I 1557.241s run_tests_on_device(02740f1a0b59aab6)    	at org.chromium.content.browser.test.util.CallbackHelper.waitForCallback(CallbackHelper.java:192)
I 1557.241s run_tests_on_device(02740f1a0b59aab6)    	at org.chromium.content.browser.test.util.CallbackHelper.waitForCallback(CallbackHelper.java:198)
I 1557.241s run_tests_on_device(02740f1a0b59aab6)    	at org.chromium.chrome.browser.payments.PaymentRequestTestBase.clickAndWait(PaymentRequestTestBase.java:164)
I 1557.242s run_tests_on_device(02740f1a0b59aab6)    	at org.chromium.chrome.browser.payments.PaymentRequestFreeShippingTest.testAddInvalidAddressAndCancel(PaymentRequestFreeShippingTest.java:68)
I 1557.242s run_tests_on_device(02740f1a0b59aab6)    	at java.lang.reflect.Method.invokeNative(Native Method)
I 1557.242s run_tests_on_device(02740f1a0b59aab6)    	at android.test.InstrumentationTestCase.runMethod(InstrumentationTestCase.java:214)
I 1557.242s run_tests_on_device(02740f1a0b59aab6)    	at android.test.InstrumentationTestCase.runTest(InstrumentationTestCase.java:199)
I 1557.242s run_tests_on_device(02740f1a0b59aab6)    	at android.test.ActivityInstrumentationTestCase2.runTest(ActivityInstrumentationTestCase2.java:192)
I 1557.242s run_tests_on_device(02740f1a0b59aab6)    	at org.chromium.chrome.test.ChromeActivityTestCaseBase.runTest(ChromeActivityTestCaseBase.java:726)
I 1557.242s run_tests_on_device(02740f1a0b59aab6)    	at org.chromium.base.test.BaseTestResult.runParameterized(BaseTestResult.java:161)
I 1557.243s run_tests_on_device(02740f1a0b59aab6)    	at org.chromium.base.test.BaseTestResult.run(BaseTestResult.java:124)
I 1557.243s run_tests_on_device(02740f1a0b59aab6)    	at android.test.AndroidTestRunner.runTest(AndroidTestRunner.java:191)
I 1557.243s run_tests_on_device(02740f1a0b59aab6)    	at android.test.AndroidTestRunner.runTest(AndroidTestRunner.java:176)
I 1557.243s run_tests_on_device(02740f1a0b59aab6)    	at android.test.InstrumentationTestRunner.onStart(InstrumentationTestRunner.java:554)
I 1557.243s run_tests_on_device(02740f1a0b59aab6)    	at android.app.Instrumentation$InstrumentationThread.run(Instrumentation.java:1701)

it's being flaky for such a long time that I didn't bother to find the offending CL. 
rouslan@: assign this to you because you wrote it.