Implement authenticator based on SPAKE2 implementation in boringssl.

remoting/remoting_test.gypi

Index: remoting/remoting_test.gypi
diff --git a/remoting/remoting_test.gypi b/remoting/remoting_test.gypi
index 5e36aa0b1c2c2e6411475547e442f72b8630df9c..fcf4125515d4ad5bec249102a76952f2abfe822f 100644
--- a/remoting/remoting_test.gypi
+++ b/remoting/remoting_test.gypi
@@ -337,6 +337,7 @@
         'protocol/ppapi_module_stub.cc',
         'protocol/pseudotcp_adapter_unittest.cc',
         'protocol/session_config_unittest.cc',
+        'protocol/spake2_authenticator_unittest.cc',
         'protocol/ssl_hmac_channel_authenticator_unittest.cc',
         'protocol/third_party_authenticator_unittest.cc',
         'protocol/v2_authenticator_unittest.cc',
@@ -414,6 +415,11 @@
             '../components/components.gyp:policy',
           ],
         }],
+        ['use_openssl == 0', {
+          'sources!': [
+            'protocol/spake2_authenticator_unittest.cc',
+          ],
+        }],
       ],  # end of 'conditions'
     },  # end of target 'remoting_unittests'
     {