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
diff --git a/Android.bp b/Android.bp
index ccd04a4..f170afa 100644
--- a/Android.bp
+++ b/Android.bp
@@ -179,6 +179,7 @@
     cppflags: [
         "-fsized-deallocation",
         "-fexceptions",
+        "-fcoroutines-ts",
         "-Wno-format-zero-length",
         "-Wno-implicit-fallthrough",
         "-Wno-non-virtual-dtor",