Adding synthetic field trial for DataReductionProxyEnabled

components/data_reduction_proxy/browser/data_reduction_proxy_settings.cc

Index: components/data_reduction_proxy/browser/data_reduction_proxy_settings.cc
diff --git a/components/data_reduction_proxy/browser/data_reduction_proxy_settings.cc b/components/data_reduction_proxy/browser/data_reduction_proxy_settings.cc
index 3f4f0ea1a3d4aa08e601a1dbb7db60c991e6d44b..ddb13744ad51c2ca36fbc84519a906ff12b96f8e 100644
--- a/components/data_reduction_proxy/browser/data_reduction_proxy_settings.cc
+++ b/components/data_reduction_proxy/browser/data_reduction_proxy_settings.cc
@@ -121,7 +121,8 @@ void DataReductionProxySettings::InitPrefMembers() {
 void DataReductionProxySettings::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) {
   DCHECK(thread_checker_.CalledOnValidThread());
   DCHECK(prefs);
   DCHECK(local_state_prefs);
@@ -129,8 +130,12 @@ void DataReductionProxySettings::InitDataReductionProxySettings(
   prefs_ = prefs;
   local_state_prefs_ = local_state_prefs;
   url_request_context_getter_ = url_request_context_getter;
+  on_data_reduction_proxy_enabled_ = on_data_reduction_proxy_enabled;
   InitPrefMembers();
   RecordDataReductionInit();
+
+  on_data_reduction_proxy_enabled_.Run(IsDataReductionProxyEnabled());
+
   // Disable the proxy if it is not allowed to be used.
   if (!params_->allowed())
     return;
@@ -146,10 +151,12 @@ void DataReductionProxySettings::InitDataReductionProxySettings(
     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) {
   InitDataReductionProxySettings(prefs,
                                  local_state_prefs,
-                                 url_request_context_getter);
+                                 url_request_context_getter,
+                                 on_data_reduction_proxy_enabled);
   SetProxyConfigurator(configurator.Pass());
 }
 
@@ -358,6 +365,7 @@ void DataReductionProxySettings::OnIPAddressChanged() {
 
 void DataReductionProxySettings::OnProxyEnabledPrefChange() {
   DCHECK(thread_checker_.CalledOnValidThread());
+  on_data_reduction_proxy_enabled_.Run(IsDataReductionProxyEnabled());
   if (!params_->allowed())
     return;
   MaybeActivateDataReductionProxy(false);