Read NQE prefs to network quality store under all cases

net/nqe/network_quality_estimator_params.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/nqe/network_quality_estimator_params.h"
 
 #include <stdint.h>
 
 #include "base/strings/string_number_conversions.h"
 #include "base/time/time.h"
@@ skipping 351 matching lines @@
   bool effective_connection_type_available = GetEffectiveConnectionTypeForName(
       forced_value, &forced_effective_connection_type);
   DCHECK(effective_connection_type_available);
 
   // Silence unused variable warning in release builds.
   (void)effective_connection_type_available;
 
   return forced_effective_connection_type;
 }
 
+bool persistent_cache_reading_enabled(
+    const std::map<std::string, std::string>& variation_params) {
+  if (GetStringValueForVariationParamWithDefaultValue(
+          variation_params, "persistent_cache_reading_enabled", "false") !=
+      "true") {
+    return false;
+  }
+  return true;
+}
+
 }  // namespace internal
 
 }  // namespace nqe
 
 }  // namespace net