This also appears to be related to https://codereview.chromium.org/1855663002/

yes just checked the times it is most likely https://codereview.chromium.org/1855663002 which landed about the right time both the M and L bots started having issues.

it looks like the M bot is not picking up the latest system webview build..

wondering if we just should revert the cl since it's causing significant pain...

I would prefer not to. uploading a sync shell change now.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/tools/build.git/+/64628b305d39be950d5e6d630feb2160acde1c67

commit 64628b305d39be950d5e6d630feb2160acde1c67
Author: jbudorick@chromium.org <jbudorick@chromium.org>
Date: Wed Apr 06 17:16:47 2016

[Android] Install SystemWebView.apk for SystemWebViewShellLayoutTest.apk.

BUG= 601019 
TBR=phajdan.jr@chromium.org

Review URL: https://codereview.chromium.org/1859343003

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/build@299736 0039d316-1c4b-4281-b951-d872f2087c98

[modify] https://crrev.com/64628b305d39be950d5e6d630feb2160acde1c67/scripts/slave/recipe_modules/chromium_android/api.py
[modify] https://crrev.com/64628b305d39be950d5e6d630feb2160acde1c67/scripts/slave/recipe_modules/chromium_tests/steps.py
[modify] https://crrev.com/64628b305d39be950d5e6d630feb2160acde1c67/scripts/slave/recipes/chromium.expected/full_chromium_android_Android_Webview_L__dbg_.json
[modify] https://crrev.com/64628b305d39be950d5e6d630feb2160acde1c67/scripts/slave/recipes/chromium.expected/full_chromium_android_Android_Webview_M__dbg_.json

Did this one https://uberchromegw.corp.google.com/i/chromium.android/builders/Android%20Webview%20M%20(dbg) pick up this change in the last build? It seems to be red still.

Or is that a different failure?

X(

I got the path wrong.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/tools/build.git/+/babb4b2f3952c7284424698fbc46f44e24776d61

commit babb4b2f3952c7284424698fbc46f44e24776d61
Author: jbudorick@chromium.org <jbudorick@chromium.org>
Date: Wed Apr 06 19:44:01 2016

[Android] Fix SystemWebView.apk path for SystemWebViewShellLayoutTest.apk.

BUG= 601019 
TBR=phajdan.jr@chromium.org,yusufo@chromium.org

Review URL: https://codereview.chromium.org/1864233002

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/build@299748 0039d316-1c4b-4281-b951-d872f2087c98

[modify] https://crrev.com/babb4b2f3952c7284424698fbc46f44e24776d61/scripts/slave/recipe_modules/chromium_tests/steps.py
[modify] https://crrev.com/babb4b2f3952c7284424698fbc46f44e24776d61/scripts/slave/recipes/chromium.expected/full_chromium_android_Android_Webview_L__dbg_.json
[modify] https://crrev.com/babb4b2f3952c7284424698fbc46f44e24776d61/scripts/slave/recipes/chromium.expected/full_chromium_android_Android_Webview_M__dbg_.json

This doesn't seem to be fixed. See https://uberchromegw.corp.google.com/i/chromium.android/builders/Android%20Webview%20L%20(dbg)/builds/12520

and 

https://uberchromegw.corp.google.com/i/chromium.android/builders/Android%20Webview%20M%20(dbg)/builds/8165

#13: that's a different problem with similar symptoms. Filed separately as 606543

I see that now. https://codereview.chromium.org/1920023004/ is the fix.