[Android] Create out directory for sharded perf tests during setup.

build/android/pylib/perf/test_runner.py

Index: build/android/pylib/perf/test_runner.py
diff --git a/build/android/pylib/perf/test_runner.py b/build/android/pylib/perf/test_runner.py
index f125a234b0b9c7c0b9cd514b3d6bdc93cb65e5c7..bded68fb7f8270a9781112f83f03dd2329f8cac9 100644
--- a/build/android/pylib/perf/test_runner.py
+++ b/build/android/pylib/perf/test_runner.py
@@ -46,16 +46,12 @@ import pexpect
 import pickle
 import os
 import sys
-import time
 
 from pylib import constants
 from pylib.base import base_test_result
 from pylib.base import base_test_runner
 
 
-_OUTPUT_DIR = os.path.join(constants.DIR_SOURCE_ROOT, 'out', 'step_results')
-
-
 def PrintTestOutput(test_name):
   """Helper method to print the output of previously executed test_name.
 
@@ -65,7 +61,7 @@ def PrintTestOutput(test_name):
   Returns:
     exit code generated by the test step.
   """
-  file_name = os.path.join(_OUTPUT_DIR, test_name)
+  file_name = os.path.join(constants.PERF_OUTPUT_DIR, test_name)
   if not os.path.exists(file_name):
     logging.error('File not found %s', file_name)
     return 1
@@ -98,7 +94,8 @@ class TestRunner(base_test_runner.BaseTestRunner):
 
   @staticmethod
   def _SaveResult(result):
-    with file(os.path.join(_OUTPUT_DIR, result['name']), 'w') as f:
+    with file(os.path.join(constants.PERF_OUTPUT_DIR,
+                           result['name']), 'w') as f:
       f.write(pickle.dumps(result))
 
   def _LaunchPerfTest(self, test_name):