Add flag to override Effective Connection Type

net/nqe/effective_connection_type.h

 // 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.
 
 #ifndef NET_NQE_EFFECTIVE_CONNECTION_TYPE_H_
 #define NET_NQE_EFFECTIVE_CONNECTION_TYPE_H_
 
 #include "base/strings/string_piece.h"
 #include "net/base/net_export.h"
 
 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
 // use are the same, but often a network connection performs significantly
 // differently, usually worse, from its expected capabilities.
 // EffectiveConnectionType of a network is independent of if the current
 // connection is metered or not. For example, an unmetered slow connection may
 // have EFFECTIVE_CONNECTION_TYPE_SLOW_2G as its effective connection type. The
 // effective connection type enums are be in increasing order of quality.
 // GENERATED_JAVA_ENUM_PACKAGE: org.chromium.net
@@ skipping 42 matching lines @@
     EffectiveConnectionType* effective_connection_type);
 
 // Returns the string equivalent of |type|. Deprecated, and replaced by
 // GetNameForEffectiveConnectionType.
 NET_EXPORT_PRIVATE const char* DeprecatedGetNameForEffectiveConnectionType(
     EffectiveConnectionType type);
 
 }  // namespace net
 
 #endif  // NET_NQE_EFFECTIVE_CONNECTION_TYPE_H_