[Experimental Framework] Move the trial token public key out of content and into the embedder.

chrome/renderer/origin_trials/origin_trial_key_manager.h

Index: chrome/renderer/origin_trials/origin_trial_key_manager.h
diff --git a/chrome/renderer/origin_trials/origin_trial_key_manager.h b/chrome/renderer/origin_trials/origin_trial_key_manager.h
new file mode 100644
index 0000000000000000000000000000000000000000..18b01d841a82a93fcbd1e94f17b89d25b96b550d
--- /dev/null
+++ b/chrome/renderer/origin_trials/origin_trial_key_manager.h
@@ -0,0 +1,15 @@
+// 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.
+
+#ifndef CHROME_RENDERER_ORIGIN_TRIALS_ORIGIN_TRIAL_KEY_MANAGER_H_
+#define CHROME_RENDERER_ORIGIN_TRIALS_ORIGIN_TRIAL_KEY_MANAGER_H_
+
+#include "base/strings/string_piece.h"
+
+class OriginTrialKeyManager {
+ public:
+  base::StringPiece GetPublicKey();
+};
+
+#endif  // CHROME_RENDERER_ORIGIN_TRIALS_ORIGIN_TRIAL_KEY_MANAGER_H_