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

build/android/pylib/perf/setup.py

Index: build/android/pylib/perf/setup.py
diff --git a/build/android/pylib/perf/setup.py b/build/android/pylib/perf/setup.py
index 5d0272d2f71e010cdfdd6ef1ddecc5646ad5ef88..07d1b6c17cfaa7cf802eda4d27264dd368825fc7 100644
--- a/build/android/pylib/perf/setup.py
+++ b/build/android/pylib/perf/setup.py
@@ -13,6 +13,7 @@ import time
 
 from pylib import android_commands
 from pylib import cmd_helper
+from pylib import constants
 from pylib import forwarder
 from pylib import ports
 
@@ -56,6 +57,9 @@ def Setup(test_options):
   Returns:
     A tuple of (TestRunnerFactory, tests).
   """
+  if not os.path.exists(constants.PERF_OUTPUT_DIR):
+    os.makedirs(constants.PERF_OUTPUT_DIR)
+
   # Before running the tests, kill any leftover server.
   _KillPendingServers()