Treat sharded perf test timeouts as failures.

Previously, we'd halt running all further shards upon a timeout. Now, we'll just
fail the one step and then continue.

BUG=392490

Review URL: https://codereview.chromium.org/378423002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@282247 0039d316-1c4b-4281-b951-d872f2087c98

build/android/pylib/perf/test_runner.py

@@ -240,6 +240,9 @@ class TestRunner(base_test_runner.BaseTestRunner):
     try:
       exit_code, output = cmd_helper.GetCmdStatusAndOutputWithTimeout(
           full_cmd, timeout, cwd=cwd, shell=True, logfile=logfile)
+    except cmd_helper.TimeoutError as e:
+      exit_code = -1
+      output = str(e)
     finally:
       if self._options.single_step:
         logfile.stop()