Allow flagging tests that arent dependent on polling strategy

tools/buildgen/plugins/make_fuzzer_tests.py

@@ -51,6 +51,7 @@ def mako_plugin(dictionary):
               'exclude_configs': [],
               'platforms': ['linux', 'mac', 'windows', 'posix'],
               'ci_platforms': ['linux', 'mac', 'windows', 'posix'],
+              'uses_polling': False,
               'flaky': False,
               'language': 'c',
               'cpu_cost': 0.1,

tools/run_tests/run_tests.py

@@ -159,12 +159,15 @@ class CLanguage(object):
       'posix': ['all'],
       'linux': ['poll', 'legacy']
     }
-    for polling_strategy in POLLING_STRATEGIES[self.platform]:
+    for target in binaries:
+      polling_strategies = (POLLING_STRATEGIES[self.platform]
+                            if target.get('uses_polling', True)
+                            else ['all'])
+      for polling_strategy in polling_strategies:
         env={'GRPC_DEFAULT_SSL_ROOTS_FILE_PATH':
                  _ROOT + '/src/core/lib/tsi/test_creds/ca.pem',
              'GRPC_POLLING_STRATEGY': polling_strategy}
         shortname_ext = '' if polling_strategy=='all' else ' polling=%s' % polling_strategy
-      for target in binaries:
         if self.config.build_config in target['exclude_configs']:
           continue
         if self.platform == 'windows':