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..a4938139ac76cceee57d898b5a26e1970cc70c64 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"
@@ -121,6 +122,11 @@ class DataReductionProxySettings
       net::URLRequestContextGetter* url_request_context_getter,
       scoped_ptr<DataReductionProxyConfigurator> configurator);
 
+  // Sets the |on_data_reduction_proxy_enabled_| callback and runs to register
+  // the DataReductionProxyEnabled synthetic field trial.
+  void SetOnDataReductionEnabledCallback(
+      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.
   void SetProxyConfigurator(
@@ -310,6 +316,8 @@ 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_;