Add flag to override Effective Connection Type

net/nqe/network_quality_estimator_params.h

Index: net/nqe/network_quality_estimator_params.h
diff --git a/net/nqe/network_quality_estimator_params.h b/net/nqe/network_quality_estimator_params.h
index 17292b1f7ac68174938a786701c1fdfc2bdb0268..2a50fe661cfdc773469f233d09e19f57c2d8c948 100644
--- a/net/nqe/network_quality_estimator_params.h
+++ b/net/nqe/network_quality_estimator_params.h
@@ -11,12 +11,17 @@
 #include "base/macros.h"
 #include "base/optional.h"
 #include "base/threading/thread_checker.h"
+#include "net/base/net_export.h"
 #include "net/base/network_change_notifier.h"
 #include "net/nqe/effective_connection_type.h"
 #include "net/nqe/network_quality.h"
 
 namespace net {
 
+// Forces NQE to return a specific effective connection type. Set using the
+// |params| provided to the NetworkQualityEstimatorParams constructor.
+NET_EXPORT extern const char kForceEffectiveConnectionType[];
+
 namespace nqe {
 
 namespace internal {