Allow command-line arguments to override EF public key

chrome/browser/origin_trials/origin_trial_controller.cc

Index: chrome/browser/origin_trials/origin_trial_controller.cc
diff --git a/chrome/browser/origin_trials/origin_trial_controller.cc b/chrome/browser/origin_trials/origin_trial_controller.cc
new file mode 100644
index 0000000000000000000000000000000000000000..519bfba95fccb5c4778c601a1625ef03defee236
--- /dev/null
+++ b/chrome/browser/origin_trials/origin_trial_controller.cc
@@ -0,0 +1,28 @@
+// Copyright (c) 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/origin_trials/origin_trial_controller.h"
+
+#include <string>
+
+#include "base/command_line.h"
+#include "chrome/common/chrome_switches.h"
+#include "components/variations/variations_associated_data.h"
+
+const char OriginTrialController::kFieldTrialName[] = "OriginTrials";
+const char OriginTrialController::kPublicKeyFieldName[] = "PublicKey";
+
+// static
+void OriginTrialController::UpdateCommandLineFromFieldTrials(
+    base::CommandLine* command_line) {
+  std::map<std::string, std::string> field_params;
+  if (!variations::GetVariationParams(kFieldTrialName, &field_params))
+    return;
+
+  std::string override_public_key = field_params[kPublicKeyFieldName];
+  if (!override_public_key.empty()) {
+    command_line->AppendSwitchASCII(switches::kOriginTrialPublicKey,
+                                    override_public_key);
+  }
+}