Made junit coverage-dir take directory, not file.

build/android/pylib/junit/test_runner.py

Index: build/android/pylib/junit/test_runner.py
diff --git a/build/android/pylib/junit/test_runner.py b/build/android/pylib/junit/test_runner.py
index a97841264dfaf13e314bdd553e5dda3226cc610b..54cf04a2f079810bd707f7ddb6b5a8083ba700b6 100644
--- a/build/android/pylib/junit/test_runner.py
+++ b/build/android/pylib/junit/test_runner.py
@@ -47,7 +47,8 @@ class JavaTestRunner(object):
       # Add JVM arguments.
       jvm_args = []
       if self._coverage_dir:
-        jvm_args.append('-Demma.coverage.out.file=%s' % self._coverage_dir)
+        jvm_args.append('-Demma.coverage.out.file=%s' % os.path.join(

[jbudorick, 2016/05/24 12:35:18]

This should check that self._coverage_dir exists and should make it (via
https://docs.python.org/2/library/os.html#os.makedirs) if it doesn't.

[BigBossZhiling, 2016/05/24 17:41:33]

That's a good point, but I just tested on it and it seems like this emma
coverage will automatically create the directory.

[jbudorick, 2016/05/24 19:15:09]

I'd still prefer we create it here.

[BigBossZhiling, 2016/05/24 19:28:52]

Done.

+            self._coverage_dir, '%s.ec' % self._test_suite))
       if jvm_args:
         command.extend(['--jvm-args', '"%s"' % ' '.join(jvm_args)])