Add function that converts string connection type to ECT

net/nqe/network_quality_estimator_unittest.cc

Index: net/nqe/network_quality_estimator_unittest.cc
diff --git a/net/nqe/network_quality_estimator_unittest.cc b/net/nqe/network_quality_estimator_unittest.cc
index 52d5bf7b81646c31193df6016d0e377591a97eda..68ca6304016bdfe530a5788b1bc4d9816199878b 100644
--- a/net/nqe/network_quality_estimator_unittest.cc
+++ b/net/nqe/network_quality_estimator_unittest.cc
@@ -1678,4 +1678,22 @@ TEST(NetworkQualityEstimatorTest, MAYBE_RecordAccuracy) {
   }
 }
 
+// Tests that the effective connection type is converted correctly to a
+// descriptive string name, and vice-versa.
+TEST(NetworkQualityEstimatorTest, NameConnectionTypeConversion) {
+  for (size_t i = 0;
+       i < NetworkQualityEstimator::EFFECTIVE_CONNECTION_TYPE_LAST; ++i) {
+    const NetworkQualityEstimator::EffectiveConnectionType
+        effective_connection_type =
+            static_cast<NetworkQualityEstimator::EffectiveConnectionType>(i);
+    std::string connection_type_name =
+        std::string(NetworkQualityEstimator::GetNameForEffectiveConnectionType(
+            effective_connection_type));
+    EXPECT_FALSE(connection_type_name.empty());
+    EXPECT_EQ(effective_connection_type,
+              NetworkQualityEstimator::GetEffectiveConnectionTypeForName(
+                  connection_type_name));
+  }
+}
+
 }  // namespace net