Move trial token code to content/common.

chrome/common/origin_trials/origin_trial_key_manager.h

Index: chrome/common/origin_trials/origin_trial_key_manager.h
diff --git a/chrome/common/origin_trials/origin_trial_key_manager.h b/chrome/common/origin_trials/origin_trial_key_manager.h
new file mode 100644
index 0000000000000000000000000000000000000000..cd6b2453b15ec4ef3a48722509766a0db0bcd013
--- /dev/null
+++ b/chrome/common/origin_trials/origin_trial_key_manager.h
@@ -0,0 +1,17 @@
+// 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_COMMON_ORIGIN_TRIALS_ORIGIN_TRIAL_KEY_MANAGER_H_
+#define CHROME_COMMON_ORIGIN_TRIALS_ORIGIN_TRIAL_KEY_MANAGER_H_
+
+#include "base/strings/string_piece.h"
+
+// This class is instantiated on the main/ui thread, but its methods can be
+// accessed from any thread.
+class OriginTrialKeyManager {

[Nico, 2016/03/11 21:49:05]

(why is this an instantiated class instead of just a function?)

[Marijn Kruisselbrink, 2016/03/11 21:56:36]

I'm not sure. I think iclelland@ had some future plans to do things like caching
signature verification results, if that turned out to be a bottleneck, so I
assume this is instantiated to be able to store that state.

+ public:
+  base::StringPiece GetPublicKey();
+};
+
+#endif  // CHROME_COMMON_ORIGIN_TRIALS_ORIGIN_TRIAL_KEY_MANAGER_H_