Show a 'remember me' checkbox in the web-app when connecting to a host that supports pairing.

remoting/protocol/authenticator.h

Index: remoting/protocol/authenticator.h
diff --git a/remoting/protocol/authenticator.h b/remoting/protocol/authenticator.h
index 43cf64624ef0fab9922b8b4415b3640e97fc5082..9bc4bfbd7a2c895d47d657c662107785cdaba69a 100644
--- a/remoting/protocol/authenticator.h
+++ b/remoting/protocol/authenticator.h
@@ -21,7 +21,8 @@ class ChannelAuthenticator;
 
 typedef base::Callback<void(const std::string& secret)> SecretFetchedCallback;
 typedef base::Callback<void(
-    const SecretFetchedCallback& secret_fetched_callback)> FetchSecretCallback;
+    const SecretFetchedCallback& secret_fetched_callback,
+    bool pairing_supported)> FetchSecretCallback;
 
 // Authenticator is an abstract interface for authentication protocol
 // implementations. Different implementations of this interface may be