[Android] Adds directory cleanup/creation for code coverage

build/android/pylib/instrumentation/setup.py

 # Copyright 2013 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.
 
 """Generates test runner factory and tests for instrumentation tests."""
 
 import logging
+import os
 
 import test_package
 import test_runner
 
 
 def Setup(test_options):
   """Create and return the test runner factory and tests.
 
   Args:
     test_options: An InstrumentationOptions object.
 
   Returns:
     A tuple of (TestRunnerFactory, tests).
   """
+  if (test_options.coverage_dir and not
+      os.path.exists(test_options.coverage_dir)):
+    os.makedirs(test_options.coverage_dir)
+
   test_pkg = test_package.TestPackage(test_options.test_apk_path,
                                       test_options.test_apk_jar_path)
   tests = test_pkg._GetAllMatchingTests(
       test_options.annotations,
       test_options.exclude_annotations,
       test_options.test_filter)
   if not tests:
     logging.error('No instrumentation tests to run with current args.')
 
   def TestRunnerFactory(device, shard_index):
     return test_runner.TestRunner(test_options, device, shard_index,
                                   test_pkg, [])
 
   return (TestRunnerFactory, tests)