Add DataReductionProxyExperimentsStats and UMA for measuring potentially non-compressed bytes.

components/cronet/android/cronet_data_reduction_proxy.cc

 // Copyright 2015 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/cronet/android/cronet_data_reduction_proxy.h"
 
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "base/prefs/pref_registry_simple.h"
 #include "base/prefs/pref_service.h"
@@ skipping 98 matching lines @@
   url_request_context_getter_ =
       new net::TrivialURLRequestContextGetter(
           context, task_runner_);
   scoped_ptr<data_reduction_proxy::DataReductionProxyCompressionStats>
       compression_stats(
           new data_reduction_proxy::DataReductionProxyCompressionStats(
               prefs_.get(), task_runner_, base::TimeDelta()));
   scoped_ptr<data_reduction_proxy::DataReductionProxyService>
       data_reduction_proxy_service(
           new data_reduction_proxy::DataReductionProxyService(
-              compression_stats.Pass(), settings_.get(),
+              compression_stats.Pass(), settings_.get(), prefs_.get(),
               url_request_context_getter_.get(), task_runner_));
   io_data_->SetDataReductionProxyService(
       data_reduction_proxy_service->GetWeakPtr());
   settings_->InitDataReductionProxySettings(
       prefs_.get(), io_data_.get(), data_reduction_proxy_service.Pass());
   settings_->SetDataReductionProxyEnabled(enable);
   settings_->MaybeActivateDataReductionProxy(true);
 }
 
 }  // namespace cronet