Restore HAS_OPENSSL.

Reviewed in https://codereview.appspot.com/7323052/.
diff --git a/oauth2client/client.py b/oauth2client/client.py
index 3370688..918539a 100644
--- a/oauth2client/client.py
+++ b/oauth2client/client.py
@@ -37,10 +37,13 @@
 from oauth2client import util
 from oauth2client.anyjson import simplejson
 
+HAS_OPENSSL = False
 HAS_CRYPTO = False
 try:
   from oauth2client import crypt
   HAS_CRYPTO = True
+  if crypt.OpenSSLVerifier is not None:
+    HAS_OPENSSL = True
 except ImportError:
   pass
 
diff --git a/tests/test_oauth2client_jwt.py b/tests/test_oauth2client_jwt.py
index 960a55a..0016153 100644
--- a/tests/test_oauth2client_jwt.py
+++ b/tests/test_oauth2client_jwt.py
@@ -42,6 +42,8 @@
 from oauth2client.client import SignedJwtAssertionCredentials
 from oauth2client.client import VerifyJwtTokenError
 from oauth2client.client import verify_id_token
+from oauth2client.client import HAS_OPENSSL
+from oauth2client.client import HAS_CRYPTO
 from oauth2client.file import Storage
 
 
@@ -310,6 +312,10 @@
     except NotImplementedError:
       pass
 
+class TestHasOpenSSLFlag(unittest.TestCase):
+  def test_true(self):
+    self.assertEqual(True, HAS_OPENSSL)
+    self.assertEqual(True, HAS_CRYPTO)
 
 if __name__ == '__main__':
   unittest.main()