Enable testing C++ coroutines TS.

Test: ./run_tests.py --bitness 32
Test: ./run_tests.py --bitness 64
Test: ./run_tests.py --bitness 64 --host
Bug: None
Change-Id: I620c999b6c156129257d3937b0893f45a6d3fddd

utils/libcxx/android/test/config.py

@@ -107,6 +107,7 @@ class Configuration(libcxx.test.config.Configuration):
         self.config.available_features.add('c++experimental')
         self.config.available_features.add('c++fs')
         self.config.available_features.add('c++filesystem')
+        self.config.available_features.add('fcoroutines-ts')
         std_pattern = re.compile(r'-std=(c\+\+\d[0-9x-z])')
         match = std_pattern.search(self.cxx.cxx_template)
         if match: