[android] Fix suite error message.

BUG=None
TEST=None
NOTRY=True

Review URL: https://chromiumcodereview.appspot.com/18641005

git-svn-id: http://src.chromium.org/svn/trunk/src/build@211156 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

android/pylib/gtest/dispatch.py

@@ -62,7 +62,7 @@ def _FullyQualifiedTestSuites(exe, option_test_suite, build_type):
       raise Exception('Test suite %s not found in %s.\n'
                       'Supported test suites:\n %s\n'
                       'Ensure it has been built.\n' %
-                      (t, q, gtest_config.STABLE_TEST_SUITES))
+                      (t, q, [s.name for s in gtest_config.STABLE_TEST_SUITES]))
   return qualified_test_suites