Implement exponential backoff for failed Me2Me authentication attempts

remoting/protocol/session_manager.h

Index: remoting/protocol/session_manager.h
diff --git a/remoting/protocol/session_manager.h b/remoting/protocol/session_manager.h
index 1a3e8aa4dd267e080f13f442216ce6d234decd10..2cc575914650f4dcc1c1f6daf4eeb79c02a0b1c8 100644
--- a/remoting/protocol/session_manager.h
+++ b/remoting/protocol/session_manager.h
@@ -110,8 +110,18 @@ class SessionManager : public base::NonThreadSafe {
   virtual ~SessionManager() { }
 
   enum IncomingSessionResponse {
+    // Accept the session.
     ACCEPT,
+
+    // Reject the session due to incompatible session configuration.
     INCOMPATIBLE,
+
+    // Reject the session because the host is currently disabled due
+    // to previous login attempts.
+    DISABLED,
+
+    // Reject the session because the client is not allowed to connect
+    // to the host.
     DECLINE,
   };