Store Origin Trials public key in browser prefs

chrome/browser/prefs/origin_trial_prefs.cc

Index: chrome/browser/prefs/origin_trial_prefs.cc
diff --git a/chrome/browser/prefs/origin_trial_prefs.cc b/chrome/browser/prefs/origin_trial_prefs.cc
new file mode 100644
index 0000000000000000000000000000000000000000..72e0bcaf7dd3e61e7855e20f105a8f18e1abb3d7
--- /dev/null
+++ b/chrome/browser/prefs/origin_trial_prefs.cc
@@ -0,0 +1,13 @@
+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "chrome/browser/prefs/origin_trial_prefs.h"
+
+#include "chrome/common/pref_names.h"
+#include "components/prefs/pref_registry_simple.h"
+
+// static
+void OriginTrialPrefs::RegisterPrefs(PrefRegistrySimple* registry) {
+  registry->RegisterStringPref(prefs::kOriginTrialPublicKey, "");
+}