Add timeout check for connectivity_checker.

chromecast/net/connectivity_checker_impl.h

Index: chromecast/net/connectivity_checker_impl.h
diff --git a/chromecast/net/connectivity_checker_impl.h b/chromecast/net/connectivity_checker_impl.h
index f356234f2ab6b23f93031b81cd6e12641d17e8b6..8e74bafb4737a42ac92b690489a815d0306c2310 100644
--- a/chromecast/net/connectivity_checker_impl.h
+++ b/chromecast/net/connectivity_checker_impl.h
@@ -64,6 +64,9 @@ class ConnectivityCheckerImpl
   // Called when URL request failed.
   void OnUrlRequestError();
 
+  // Called when URL request timed out.
+  void OnUrlRequestTimeOut(unsigned int request_index);
+
   scoped_ptr<GURL> connectivity_check_url_;
   scoped_ptr<net::URLRequestContext> url_request_context_;
   scoped_ptr<net::URLRequest> url_request_;
@@ -71,6 +74,7 @@ class ConnectivityCheckerImpl
   bool connected_;
   // Number of connectivity check errors.
   unsigned int check_errors_;
+  unsigned int request_index_;
 
   DISALLOW_COPY_AND_ASSIGN(ConnectivityCheckerImpl);
 };