Link to example of failing build:
https://uberchromegw.corp.google.com/i/chromium.linux/builders/Android%20Tests/builds/34790

Failing with stack:

org.chromium.android_webview.test.AwServiceWorkerClientTest#testInvokeInterceptCallback (run #1):
java.util.concurrent.TimeoutException: waitForCallback timed out!
	at org.chromium.base.test.util.CallbackHelper.waitForCallback(CallbackHelper.java:183)
	at org.chromium.base.test.util.CallbackHelper.waitForCallback(CallbackHelper.java:202)
	at org.chromium.android_webview.test.AwServiceWorkerClientTest.testInvokeInterceptCallback(AwServiceWorkerClientTest.java:88)
	at java.lang.reflect.Method.invokeNative(Native Method)
	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.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:554)
	at android.app.Instrumentation$InstrumentationThread.run(Instrumentation.java:1701)


Tim, any thoughts?