Refactor OriginTrialPolicy to be an abstract interface in content/public/common

content/shell/common/shell_origin_trial_policy.h

+// 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.
+
+#ifndef CONTENT_SHELL_COMMON_SHELL_ORIGIN_TRIAL_POLICY_H_
+#define CONTENT_SHELL_COMMON_SHELL_ORIGIN_TRIAL_POLICY_H_
+
+#include "base/macros.h"
+#include "base/strings/string_piece.h"
+#include "content/public/common/origin_trial_policy.h"
+
+namespace content {
+
+class ShellOriginTrialPolicy : public OriginTrialPolicy {
+ public:
+  ShellOriginTrialPolicy();
+  ~ShellOriginTrialPolicy() override;
+
+  // OriginTrialPolicy interface
+  base::StringPiece GetPublicKey() const override;
+
+ private:
+  base::StringPiece public_key_;
+
+  DISALLOW_COPY_AND_ASSIGN(ShellOriginTrialPolicy);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_SHELL_COMMON_SHELL_ORIGIN_TRIAL_POLICY_H_