New CPAT support in DataReductionProxyConfig guarded by feature flag.

components/data_reduction_proxy/core/common/data_reduction_proxy_features.h

 // Copyright 2017 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 COMPONENTS_DATA_REDUCTION_PROXY_CORE_COMMON_DATA_REDUCTION_PROXY_FEATURES_H_
 #define COMPONENTS_DATA_REDUCTION_PROXY_CORE_COMMON_DATA_REDUCTION_PROXY_FEATURES_H_
 
 #include "base/feature_list.h"
 
 namespace data_reduction_proxy {
 namespace features {
 
 extern const base::Feature kDataReductionMainMenu;
 extern const base::Feature kDataReductionSiteBreakdown;
+extern const base::Feature kDataReductionProxyDecidesTransform;
 
 }  // namespace features
 }  // namespace data_reduction_proxy
 #endif  // COMPONENTS_DATA_REDUCTION_PROXY_CORE_COMMON_DATA_REDUCTION_PROXY_FEATURES_H_