Add command line flag to allow testing clients not connected to localhost. Otherwise, restrict conn…

blimp/engine/app/switches.h

Index: blimp/engine/app/switches.h
diff --git a/blimp/engine/app/switches.h b/blimp/engine/app/switches.h
index b7c807fd9bbbb6c1ae0805b16140064d39139470..6fb4930d0655a991eaa1f339df430a06ef5bb3c7 100644
--- a/blimp/engine/app/switches.h
+++ b/blimp/engine/app/switches.h
@@ -11,6 +11,9 @@ namespace engine {
 // The port to listen to for incoming TCP connections.
 extern const char kEnginePort[];
 
+// Flag enabling access by clients from non-localhost IP addresses.
+extern const char kAllowNonLocalhost[];
+
 }  // namespace engine
 }  // namespace blimp