Added flag to enable the data reduction proxy alternative

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 <vector>
 
 #include "base/command_line.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 19 matching lines @@
 namespace data_reduction_proxy {
 
 // static
 bool DataReductionProxyParams::IsIncludedInFieldTrial() {
   return base::FieldTrialList::FindFullName(
       "DataCompressionProxyRollout") == kEnabled;
 }
 
 // static
 bool DataReductionProxyParams::IsIncludedInAlternativeFieldTrial() {
-  return base::FieldTrialList::FindFullName(
-      "DataCompressionProxyAlternativeConfiguration") == kEnabled;
+  const std::string group_name = base::FieldTrialList::FindFullName(
+      "DataCompressionProxyAlternativeConfiguration");
+  if (CommandLine::ForCurrentProcess()->HasSwitch(
+          data_reduction_proxy::switches::kEnableDataReductionProxyAlt)) {
+    return true;
+  }
+  return group_name == kEnabled;
 }
 
 // static
 bool DataReductionProxyParams::IsIncludedInPromoFieldTrial() {
   return FieldTrialList::FindFullName(
       "DataCompressionProxyPromoVisibility") == kEnabled;
 }
 
 // static
 bool DataReductionProxyParams::IsIncludedInPreconnectHintingFieldTrial() {
@@ skipping 488 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