Added data reduction proxy holdback experiment

components/data_reduction_proxy/browser/data_reduction_proxy_params.cc

 // Copyright 2014 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 "components/data_reduction_proxy/browser/data_reduction_proxy_params.h"
 
 #include "base/command_line.h"
 #include "base/metrics/field_trial.h"
 #include "components/data_reduction_proxy/common/data_reduction_proxy_switches.h"
 #include "net/proxy/proxy_info.h"
@@ skipping 27 matching lines @@
       "DataCompressionProxyPromoVisibility") == kEnabled;
 }
 
 // static
 bool DataReductionProxyParams::IsIncludedInPreconnectHintingFieldTrial() {
   return IsIncludedInFieldTrial() &&
       FieldTrialList::FindFullName(
           "DataCompressionProxyPreconnectHints") == kEnabled;
 }
 
+// static
+bool DataReductionProxyParams::IsIncludedInHoldbackFieldTrial() {
+  return FieldTrialList::FindFullName(
+      "DataCompressionProxyHoldback") == kEnabled;
+}
+
 DataReductionProxyParams::DataReductionProxyParams(int flags)
     : allowed_((flags & kAllowed) == kAllowed),
       fallback_allowed_((flags & kFallbackAllowed) == kFallbackAllowed),
       alt_allowed_((flags & kAlternativeAllowed) == kAlternativeAllowed),
       promo_allowed_((flags & kPromoAllowed) == kPromoAllowed),
+      holdback_((flags & kHoldback) == kHoldback),
       configured_on_command_line_(false) {
   bool result = Init(allowed_, fallback_allowed_, alt_allowed_);
   DCHECK(result);
 }
 
 DataReductionProxyParams::~DataReductionProxyParams() {
 }
 
 DataReductionProxyParams::DataReductionProxyList
 DataReductionProxyParams::GetAllowedProxies() const {
@@ skipping 302 matching lines @@
 }
 
 std::string DataReductionProxyParams::GetDefaultWarmupURL() const {
 #if defined(DATA_REDUCTION_PROXY_WARMUP_URL)
   return DATA_REDUCTION_PROXY_WARMUP_URL;
 #endif
   return std::string();
 }
 
 }  // namespace data_reduction_proxy