Adds --skip-clear-data flag to android's test_runner.py

build/android/pylib/gtest/gtest_test_instance.py

Index: build/android/pylib/gtest/gtest_test_instance.py
diff --git a/build/android/pylib/gtest/gtest_test_instance.py b/build/android/pylib/gtest/gtest_test_instance.py
index a9d061d64a2735cd6de2d037e920903a9b5e4e97..8a7d7d93571d04dea2b02f4e3659b8f4a0086f35 100644
--- a/build/android/pylib/gtest/gtest_test_instance.py
+++ b/build/android/pylib/gtest/gtest_test_instance.py
@@ -136,6 +136,7 @@ class GtestTestInstance(test_instance.TestInstance):
       raise ValueError('Platform mode currently supports only 1 gtest suite')
     self._extract_test_list_from_filter = args.extract_test_list_from_filter
     self._shard_timeout = args.shard_timeout
+    self._skip_clear_data = args.skip_clear_data
     self._suite = args.suite_name[0]
 
     incremental_part = '_incremental' if args.incremental_install else ''
@@ -249,6 +250,10 @@ class GtestTestInstance(test_instance.TestInstance):
     return self._shard_timeout
 
   @property
+  def skip_clear_data(self):
+    return self._skip_clear_data
+
+  @property
   def suite(self):
     return self._suite