v8.runtimestats.browsing_mobile failing on chromium.perf/Android One Perf

Builders failed on: 
- Android One Perf: 
  https://build.chromium.org/p/chromium.perf/builders/Android%20One%20Perf


https://chromium-swarm.appspot.com/task?id=36ee19c4fedc1510&refresh=10&show_raw=1 is a sample task.

I see this stack trace in the logcat: 
	E/StrictMode(29603): A resource was acquired at attached stack trace but never released. See java.io.Closeable for information on avoiding resource leaks.
	E/StrictMode(29603): java.lang.Throwable: Explicit termination method 'close' not called
	E/StrictMode(29603): 	at dalvik.system.CloseGuard.open(CloseGuard.java:184)
	E/StrictMode(29603): 	at dalvik.system.DexFile.<init>(DexFile.java:113)
	E/StrictMode(29603): 	at dalvik.system.DexFile.loadDex(DexFile.java:151)
	E/StrictMode(29603): 	at dalvik.system.DexPathList.loadDexFile(DexPathList.java:265)
	E/StrictMode(29603): 	at dalvik.system.DexPathList.makeDexElements(DexPathList.java:223)
	E/StrictMode(29603): 	at dalvik.system.DexPathList.<init>(DexPathList.java:109)
	E/StrictMode(29603): 	at dalvik.system.BaseDexClassLoader.<init>(BaseDexClassLoader.java:48)
	E/StrictMode(29603): 	at dalvik.system.DexClassLoader.<init>(DexClassLoader.java:57)
	E/StrictMode(29603): 	at org.chromium.webapk.lib.client.DexOptimizer.optimize(DexOptimizer.java:71)
	E/StrictMode(29603): 	at org.chromium.chrome.browser.webapps.WebApkVersionManager.updateWebApksIfNeeded(WebApkVersionManager.java:66)
	E/StrictMode(29603): 	at org.chromium.chrome.browser.init.ProcessInitializationHandler$15.doInBackground$10299ca(ProcessInitializationHandler.java:464)
	E/StrictMode(29603): 	at org.chromium.chrome.browser.init.ProcessInitializationHandler$15.doInBackground(ProcessInitializationHandler.java:425)
	E/StrictMode(29603): 	at android.os.AsyncTask$2.call(AsyncTask.java:292)
	E/StrictMode(29603): 	at java.util.concurrent.FutureTask.run(FutureTask.java:237)
	E/StrictMode(29603): 	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
	E/StrictMode(29603): 	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
	E/StrictMode(29603): 	at java.lang.Thread.run(Thread.java:818)

UI dump looks ok: 
	UI dump
	- (no package):
	  - (no id)
	- org.chromium.chrome:
	  - (no id)
	  - android:id/content
	  - org.chromium.chrome:id/action_bar_root
	  - org.chromium.chrome:id/bottom_container
	  - org.chromium.chrome:id/bottom_sheet_snackbar_container
	  - org.chromium.chrome:id/compositor_view_holder
	  - org.chromium.chrome:id/control_container
	  - org.chromium.chrome:id/coordinator
	  - org.chromium.chrome:id/location_bar
	  - org.chromium.chrome:id/location_bar_icon
	  - org.chromium.chrome:id/menu_button
	  - org.chromium.chrome:id/menu_button_wrapper
	  - org.chromium.chrome:id/overview_list_layout_holder
	  - org.chromium.chrome:id/security_button
	  - org.chromium.chrome:id/tab_switcher_button
	  - org.chromium.chrome:id/toolbar
	  - org.chromium.chrome:id/toolbar_buttons
	  - org.chromium.chrome:id/toolbar_container
	  - org.chromium.chrome:id/toolbar_shadow
	  - org.chromium.chrome:id/url_bar['https://m.youtube.com/watch?v=kkkOCtOrAcA']
	********************************************************************************

One story can't reach the device:

Exception in thread delete_temporary_file(AG860440GACE2GC):
Traceback (most recent call last):
  File "/usr/lib/python2.7/threading.py", line 810, in __bootstrap_inner
    self.run()
  File "/usr/lib/python2.7/threading.py", line 763, in run
    self.__target(*self.__args, **self.__kwargs)
  File "/b/swarming/w/ir/third_party/catapult/devil/devil/android/device_temp_file.py", line 57, in delete_temporary_file
    self._adb.Shell('rm -f %s' % self.name_quoted, expect_status=None)
  File "/b/swarming/w/ir/third_party/catapult/devil/devil/android/sdk/adb_wrapper.py", line 489, in Shell
    output = self._RunDeviceAdbCmd(args, timeout, retries, check_error=False)
  File "/b/swarming/w/ir/third_party/catapult/devil/devil/android/sdk/adb_wrapper.py", line 286, in _RunDeviceAdbCmd
    check_error=check_error)
  File "/b/swarming/w/ir/third_party/catapult/devil/devil/android/decorators.py", line 57, in timeout_retry_wrapper
    retry_if_func=retry_if_func)
  File "/b/swarming/w/ir/third_party/catapult/devil/devil/utils/timeout_retry.py", line 159, in Run
    error_log_func=error_log_func)
  File "/b/swarming/w/ir/third_party/catapult/devil/devil/utils/reraiser_thread.py", line 186, in JoinAll
    self._JoinAll(watcher, timeout)
  File "/b/swarming/w/ir/third_party/catapult/devil/devil/utils/reraiser_thread.py", line 158, in _JoinAll
    thread.ReraiseIfException()
  File "/b/swarming/w/ir/third_party/catapult/devil/devil/utils/reraiser_thread.py", line 81, in run
    self._ret = self._func(*self._args, **self._kwargs)
  File "/b/swarming/w/ir/third_party/catapult/devil/devil/utils/timeout_retry.py", line 152, in <lambda>
    child_thread = reraiser_thread.ReraiserThread(lambda: func(*args, **kwargs),
  File "/b/swarming/w/ir/third_party/catapult/devil/devil/android/decorators.py", line 47, in impl
    return f(*args, **kwargs)
  File "/b/swarming/w/ir/third_party/catapult/devil/devil/android/sdk/adb_wrapper.py", line 263, in _RunAdbCmd
    raise device_errors.DeviceUnreachableError(device_serial)
DeviceUnreachableError: AG860440GACE2GC


Seems like a bunch of issues in one :/