Add support for python3 am: 4ebbfecef0 am: 2e69c77cd6 am: 9d4418611c

Change-Id: Ie788e5de968663a01084299e3269fe7c7c6c0fa9
diff --git a/checkstyle.py b/checkstyle.py
index 914bf9a..9733848 100755
--- a/checkstyle.py
+++ b/checkstyle.py
@@ -64,7 +64,7 @@
                 'com.puppycrawl.tools.checkstyle.checks.imports.UnusedImportsCheck']
 SKIPPED_RULES_FOR_TEST_FILES = ['com.puppycrawl.tools.checkstyle.checks.javadoc.JavadocTypeCheck',
                                 'com.puppycrawl.tools.checkstyle.checks.javadoc.JavadocMethodCheck']
-SUBPATH_FOR_TEST_FILES = ['/tests/', '/test/', '/androidTest/', '/perftests/']
+SUBPATH_FOR_TEST_FILES = ['/tests/', '/test/', '/androidTest/', '/perftests/', '/gts-tests/']
 SUBPATH_FOR_TEST_DATA_FILES = _FindFoldersContaining(git.repository_root(),
                                                      'IGNORE_CHECKSTYLE')
 ERROR_UNCOMMITTED = 'You need to commit all modified files before running Checkstyle\n'