Adding synthetic field trial for DataReductionProxyEnabled

components/data_reduction_proxy/browser/data_reduction_proxy_settings.h

Index: components/data_reduction_proxy/browser/data_reduction_proxy_settings.h
diff --git a/components/data_reduction_proxy/browser/data_reduction_proxy_settings.h b/components/data_reduction_proxy/browser/data_reduction_proxy_settings.h
index 59b215738900863b0b725b45f6d26463ac4bbe16..87c508fbb0e32ace66853d8fc5b77d87625cb4ec 100644
--- a/components/data_reduction_proxy/browser/data_reduction_proxy_settings.h
+++ b/components/data_reduction_proxy/browser/data_reduction_proxy_settings.h
@@ -8,6 +8,7 @@
 #include <vector>
 
 #include "base/basictypes.h"
+#include "base/callback.h"
 #include "base/compiler_specific.h"
 #include "base/gtest_prod_util.h"
 #include "base/memory/scoped_ptr.h"
@@ -108,7 +109,8 @@ class DataReductionProxySettings
   void InitDataReductionProxySettings(
       PrefService* prefs,
       PrefService* local_state_prefs,
-      net::URLRequestContextGetter* url_request_context_getter);
+      net::URLRequestContextGetter* url_request_context_getter,
+      const base::Callback<void(bool)>& on_data_reduction_proxy_enabled);
 
   // Initializes the data reduction proxy with profile and local state prefs,
   // a |UrlRequestContextGetter| for canary probes, and a proxy configurator.
@@ -119,7 +121,8 @@ class DataReductionProxySettings
       PrefService* prefs,
       PrefService* local_state_prefs,
       net::URLRequestContextGetter* url_request_context_getter,
-      scoped_ptr<DataReductionProxyConfigurator> configurator);
+      scoped_ptr<DataReductionProxyConfigurator> configurator,
+      const base::Callback<void(bool)>& on_data_reduction_proxy_enabled);
 
   // Sets the logic the embedder uses to set the networking configuration that
   // causes traffic to be proxied.
@@ -310,6 +313,8 @@ class DataReductionProxySettings
 
   net::URLRequestContextGetter* url_request_context_getter_;
 
+  base::Callback<void(bool)> on_data_reduction_proxy_enabled_;
+
   scoped_ptr<DataReductionProxyConfigurator> configurator_;
 
   base::ThreadChecker thread_checker_;