Add tests on the extension processor registry
Add tests on the extension processor registry

Release note: n/a (test only change)

Review URL: https://codereview.appspot.com/8782045

git-svn-id: d23f85197b9dafcb1b1682eb9d0eda70517bdc52@762 4ff78f4a-9131-11de-b045-6380ec9940d4

bpsinc-native/src_third_party_pywebsocket_src,bpsinc-native/src_third_party_pywebsocket_src,bpsinc-native/src_third_party_pywebsocket_src,bpsinc-native/src_third_party_pywebsocket_src