Adding synthetic field trial for DataReductionProxyEnabled

chrome/browser/metrics/chrome_metrics_service_accessor.cc

Index: chrome/browser/metrics/chrome_metrics_service_accessor.cc
diff --git a/chrome/browser/metrics/chrome_metrics_service_accessor.cc b/chrome/browser/metrics/chrome_metrics_service_accessor.cc
index 6c142fc463278d90a643c84e5a9e44518e4c68b6..8f9d4be38f14f6b4827eebb7ce41cf877bbf0c5e 100644
--- a/chrome/browser/metrics/chrome_metrics_service_accessor.cc
+++ b/chrome/browser/metrics/chrome_metrics_service_accessor.cc
@@ -6,6 +6,7 @@
 
 #include "base/prefs/pref_service.h"
 #include "chrome/browser/browser_process.h"
+#include "chrome/browser/metrics/metrics_service_accessor.h"

[Alexei Svitkine (slow), 2014/07/30 21:33:31]

Nit: This include is unnecessary.

[megjablon, 2014/07/30 21:42:50]

Done.

 #include "chrome/common/pref_names.h"
 #include "components/metrics/metrics_service.h"
 
@@ -46,3 +47,10 @@ bool ChromeMetricsServiceAccessor::IsCrashReportingEnabled() {
   return false;
 #endif
 }
+
+// static
+bool ChromeMetricsServiceAccessor::RegisterSyntheticFieldTrial(
+    const std::string& trial, const std::string& group) {

[Alexei Svitkine (slow), 2014/07/30 21:33:31]

Nit: 1 param per line if first param is on a new line in the function signature.

[megjablon, 2014/07/30 21:42:50]

Done.

+  return MetricsServiceAccessor::RegisterSyntheticFieldTrial(
+      g_browser_process->metrics_service(), trial, group);
+}