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

components/data_reduction_proxy/core/browser/data_reduction_proxy_network_delegate.h

Index: components/data_reduction_proxy/core/browser/data_reduction_proxy_network_delegate.h
diff --git a/components/data_reduction_proxy/core/browser/data_reduction_proxy_network_delegate.h b/components/data_reduction_proxy/core/browser/data_reduction_proxy_network_delegate.h
index 0290d6e1f45f85efc4a6a0d748ea103099e9fe4b..da13b2829cb57b950e2185895921568c5de72451 100644
--- a/components/data_reduction_proxy/core/browser/data_reduction_proxy_network_delegate.h
+++ b/components/data_reduction_proxy/core/browser/data_reduction_proxy_network_delegate.h
@@ -31,6 +31,7 @@ namespace data_reduction_proxy {
 class DataReductionProxyBypassStats;
 class DataReductionProxyConfig;
 class DataReductionProxyConfigurator;
+class DataReductionProxyExperimentsStats;
 class DataReductionProxyIOData;
 class DataReductionProxyRequestOptions;
 
@@ -52,7 +53,8 @@ class DataReductionProxyNetworkDelegate : public net::LayeredNetworkDelegate {
       scoped_ptr<net::NetworkDelegate> network_delegate,
       DataReductionProxyConfig* config,
       DataReductionProxyRequestOptions* handler,
-      const DataReductionProxyConfigurator* configurator);
+      const DataReductionProxyConfigurator* configurator,
+      DataReductionProxyExperimentsStats* experiments_stats);
   ~DataReductionProxyNetworkDelegate() override;
 
   // Initializes member variables to record data reduction proxy prefs and
@@ -122,6 +124,8 @@ class DataReductionProxyNetworkDelegate : public net::LayeredNetworkDelegate {
 
   const DataReductionProxyConfigurator* configurator_;
 
+  DataReductionProxyExperimentsStats* experiments_stats_;
+
   DISALLOW_COPY_AND_ASSIGN(DataReductionProxyNetworkDelegate);
 };