Build bot consistently failing:
https://uberchromegw.corp.google.com/i/chromium.android/builders/Android%20WebView%20CTS%20L-MR1%20%28dbg%29?numbuilds=200

First broken build:
https://uberchromegw.corp.google.com/i/chromium.android/builders/Android%20WebView%20CTS%20L-MR1%20%28dbg%29/builds/14020

Stack trace:
@@@STEP_LOG_LINE@stdout@07-28 12:08:06 I/06ad8849003b6c51: android.webkit.cts.WebViewTest#testAccessHttpAuthUsernamePassword FAIL @@@
@@@STEP_LOG_LINE@stdout@java.lang.IllegalStateException: This method should only be called off the UI thread@@@
@@@STEP_LOG_LINE@stdout@at com.android.webview.chromium.WebViewChromiumFactoryProvider.runBlockingFuture(WebViewChromiumFactoryProvider.java:119)@@@
@@@STEP_LOG_LINE@stdout@at com.android.webview.chromium.WebViewChromiumFactoryProvider.runOnUiThreadBlocking(WebViewChromiumFactoryProvider.java:141)@@@
@@@STEP_LOG_LINE@stdout@at com.android.webview.chromium.WebViewChromiumFactoryProvider.getWebViewDatabase(WebViewChromiumFactoryProvider.java:541)@@@
@@@STEP_LOG_LINE@stdout@at android.webkit.WebViewDatabase.getInstance(WebViewDatabase.java:39)@@@
@@@STEP_LOG_LINE@stdout@at android.webkit.cts.WebViewTest.testAccessHttpAuthUsernamePassword(WebViewTest.java:1207)@@@
@@@STEP_LOG_LINE@stdout@at java.lang.reflect.Method.invoke(Native Method)@@@
@@@STEP_LOG_LINE@stdout@at java.lang.reflect.Method.invoke(Method.java:372)@@@
@@@STEP_LOG_LINE@stdout@at android.test.InstrumentationTestCase.runMethod(InstrumentationTestCase.java:214)@@@
@@@STEP_LOG_LINE@stdout@at android.test.InstrumentationTestCase.access$000(InstrumentationTestCase.java:36)@@@
@@@STEP_LOG_LINE@stdout@at android.test.InstrumentationTestCase$2.run(InstrumentationTestCase.java:189)@@@
@@@STEP_LOG_LINE@stdout@at android.app.Instrumentation$SyncRunnable.run(Instrumentation.java:1871)@@@
@@@STEP_LOG_LINE@stdout@at android.os.Handler.handleCallback(Handler.java:739)@@@
@@@STEP_LOG_LINE@stdout@at android.os.Handler.dispatchMessage(Handler.java:95)@@@
@@@STEP_LOG_LINE@stdout@at android.os.Looper.loop(Looper.java:135)@@@
@@@STEP_LOG_LINE@stdout@at android.app.ActivityThread.main(ActivityThread.java:5254)@@@
@@@STEP_LOG_LINE@stdout@at java.lang.reflect.Method.invoke(Native Method)@@@
@@@STEP_LOG_LINE@stdout@at java.lang.reflect.Method.invoke(Method.java:372)@@@
@@@STEP_LOG_LINE@stdout@at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)@@@
@@@STEP_LOG_LINE@stdout@at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)@@@
@@@STEP_LOG_LINE@stdout@@@@


Suspected CL:
commit	993fff8648f2701910b9efdbf1d35244fbf8ca73	[log] [tgz]
author	boliu <boliu@chromium.org>	Thu Jul 28 17:58:27 2016
committer	Commit bot <commit-bot@chromium.org>	Thu Jul 28 18:00:02 2016
tree	cfaa390d775afdffb666e8e65e9cb52d68f07da6
parent	6d5579b510fe8dcc6efb7ea1b6e881f840aa7f87 [diff]
aw: Fix FactoryProvider threading

Access thread-unsafe chromium classes on the UI thread only

BUG= 630709 

Review-Url: https://codereview.chromium.org/2180423003
Cr-Commit-Position: refs/heads/master@{#408432}