[Android] Fix a deadlock between telemetry and DeviceUtils.

tools/telemetry/telemetry/page/page_runner.py

 # Copyright 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import collections
 import copy
 import logging
 import optparse
 import os
 import random
@@ skipping 259 matching lines @@
 
       try:
         _RunPage(test, page, state, expectation,
                  results_for_current_run, finder_options)
         _CheckThermalThrottling(state.browser.platform)
       except exceptions.TabCrashException as e:
         if test.is_multi_tab_test:
           logging.error('Aborting multi-tab test after tab %s crashed',
                         page.url)
           raise
-        logging.warning(e)
+        logging.warning(str(e))
         state.StopBrowser()
 
       if finder_options.profiler:
         state.StopProfiling()
 
       if (test.StopBrowserAfterPage(state.browser, page)):
         state.StopBrowser()
 
       results_for_current_run.StopTest(page)
 
       if state.first_page[page]:
         state.first_page[page] = False
         if test.discard_first_result:
           return results
       return results_for_current_run
     except exceptions.BrowserGoneException as e:
       state.StopBrowser()
       if not tries:
         logging.error('Aborting after too many retries')
         raise
       if test.is_multi_tab_test:
         logging.error('Aborting multi-tab test after browser crashed')
         raise
-      logging.warning(e)
+      logging.warning(str(e))
 
 
 def _UpdatePageSetArchivesIfChanged(page_set):
   # Attempt to download the credentials file.
   if page_set.credentials_path:
     try:
       cloud_storage.GetIfChanged(
           os.path.join(page_set.base_dir, page_set.credentials_path))
     except (cloud_storage.CredentialsError, cloud_storage.PermissionError,
             cloud_storage.CloudStorageError) as e:
@@ skipping 265 matching lines @@
     logging.warning('Device is thermally throttled before running '
                     'performance tests, results will vary.')
 
 
 def _CheckThermalThrottling(platform):
   if not platform.CanMonitorThermalThrottling():
     return
   if platform.HasBeenThermallyThrottled():
     logging.warning('Device has been thermally throttled during '
                     'performance tests, results will vary.')