Add flag to override Effective Connection Type

net/nqe/network_quality_estimator_params.cc

Index: net/nqe/network_quality_estimator_params.cc
diff --git a/net/nqe/network_quality_estimator_params.cc b/net/nqe/network_quality_estimator_params.cc
index d88bd4aa492f74c751e41e50c58a6b6ca5fd360a..2f51903175b2aef66f44d80c9cc428505a3a46df 100644
--- a/net/nqe/network_quality_estimator_params.cc
+++ b/net/nqe/network_quality_estimator_params.cc
@@ -66,6 +66,8 @@ std::string GetStringValueForVariationParamWithDefaultValue(
 
 namespace net {
 
+const char kForceEffectiveConnectionType[] = "force_effective_connection_type";
+
 namespace nqe {
 
 namespace internal {
@@ -363,7 +365,7 @@ double NetworkQualityEstimatorParams::correlation_uma_logging_probability()
 bool NetworkQualityEstimatorParams::forced_effective_connection_type_set()
     const {
   return !GetStringValueForVariationParamWithDefaultValue(
-              params_, "force_effective_connection_type", "")
+              params_, kForceEffectiveConnectionType, "")
               .empty();
 }
 
@@ -372,7 +374,7 @@ NetworkQualityEstimatorParams::forced_effective_connection_type() const {
   EffectiveConnectionType forced_effective_connection_type =
       EFFECTIVE_CONNECTION_TYPE_UNKNOWN;
   std::string forced_value = GetStringValueForVariationParamWithDefaultValue(
-      params_, "force_effective_connection_type",
+      params_, kForceEffectiveConnectionType,
       GetNameForEffectiveConnectionType(EFFECTIVE_CONNECTION_TYPE_UNKNOWN));
   DCHECK(!forced_value.empty());
   bool effective_connection_type_available = GetEffectiveConnectionTypeForName(