Add support for Junit tests in platform mode.

build/android/pylib/base/test_instance_factory.py

Index: build/android/pylib/base/test_instance_factory.py
diff --git a/build/android/pylib/base/test_instance_factory.py b/build/android/pylib/base/test_instance_factory.py
index 2d0d83f742be6049881e33c0bd104821d3258e20..129bd7f2f62a65b636ae92723a2071788d86332f 100644
--- a/build/android/pylib/base/test_instance_factory.py
+++ b/build/android/pylib/base/test_instance_factory.py
@@ -4,6 +4,7 @@
 
 from pylib.gtest import gtest_test_instance
 from pylib.instrumentation import instrumentation_test_instance
+from pylib.junit import junit_test_instance
 from pylib.perf import perf_test_instance
 from pylib.utils import isolator
 
@@ -16,6 +17,8 @@ def CreateTestInstance(args, error_func):
   elif args.command == 'instrumentation':
     return instrumentation_test_instance.InstrumentationTestInstance(
         args, isolator.Isolator(), error_func)
+  elif args.command == 'junit':
+    return junit_test_instance.JunitTestInstance(args, error_func)
   elif args.command == 'perf':
     return perf_test_instance.PerfTestInstance(args, error_func)