[Android] Fix a deadlock between telemetry and DeviceUtils.

Many functions in Python's logging module grab a lock internally. Some
appear to do so before converting the provided message to a string via
its __str__ method.

Calling an object's __str__ method before calling a logging funciton
allows anything called by the __str__ method to log without the risk of
hitting a deadlock.

BUG=392869

Review URL: https://codereview.chromium.org/385653002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@282412 0039d316-1c4b-4281-b951-d872f2087c98

tools/telemetry/telemetry/page/page_runner.py

@@ -277,7 +277,7 @@ def _PrepareAndRunPage(test, page_set, expectations, finder_options,
           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:
@@ -301,7 +301,7 @@ def _PrepareAndRunPage(test, page_set, expectations, finder_options,
       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):