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

remoting/client/plugin/chromoting_instance.h

Index: remoting/client/plugin/chromoting_instance.h
diff --git a/remoting/client/plugin/chromoting_instance.h b/remoting/client/plugin/chromoting_instance.h
index f2844bc245161634446ad34b1742ea106c40b5d1..d90f86d869a4fcc2b79310cbdccf60087377d08b 100644
--- a/remoting/client/plugin/chromoting_instance.h
+++ b/remoting/client/plugin/chromoting_instance.h
@@ -176,6 +176,7 @@ class ChromotingInstance :
   // Immediately calls |secret_fetched_callback| with |shared_secret|.
   static void FetchSecretFromString(
       const std::string& shared_secret,
+      bool pairing_supported,
       const protocol::SecretFetchedCallback& secret_fetched_callback);
 
   // Message handlers for messages that come from JavaScript. Called
@@ -218,6 +219,7 @@ class ChromotingInstance :
   // Used as the |FetchSecretCallback| for Me2Me connections.
   // Uses the PIN request dialog in the webapp to obtain the shared secret.
   void FetchSecretFromDialog(
+      bool pairing_supported,
       const protocol::SecretFetchedCallback& secret_fetched_callback);
 
   bool initialized_;