Add flag to override Effective Connection Type

net/nqe/effective_connection_type.h

Index: net/nqe/effective_connection_type.h
diff --git a/net/nqe/effective_connection_type.h b/net/nqe/effective_connection_type.h
index 7f11ad06b8834216866bccf7c21952e1dda9ff50..b8fcc30e97bc65ef94c2da2b45d69d43bf2d2169 100644
--- a/net/nqe/effective_connection_type.h
+++ b/net/nqe/effective_connection_type.h
@@ -10,6 +10,13 @@
 
 namespace net {
 
+NET_EXPORT extern const char kEffectiveConnectionTypeUnknown[];
+NET_EXPORT extern const char kEffectiveConnectionTypeOffline[];
+NET_EXPORT extern const char kEffectiveConnectionTypeSlow2G[];
+NET_EXPORT extern const char kEffectiveConnectionType2G[];
+NET_EXPORT extern const char kEffectiveConnectionType3G[];
+NET_EXPORT extern const char kEffectiveConnectionType4G[];
+
 // EffectiveConnectionType is the connection type whose typical performance is
 // most similar to the measured performance of the network in use. In many
 // cases, the "effective" connection type and the actual type of connection in