Add disabled origin trial feature list

chrome/renderer/origin_trials/origin_trial_key_manager.h

 // 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 <set>
 #include <string>
 
 #include "base/macros.h"
 #include "base/strings/string_piece.h"
 
 class OriginTrialKeyManager {
  public:
   OriginTrialKeyManager();
   ~OriginTrialKeyManager();
 
   bool SetPublicKeyFromASCIIString(const std::string& ascii_public_key);
   base::StringPiece GetPublicKey() const;
+  bool SetDisabledFeatures(const std::string& disabled_feature_list);
+  bool IsFeatureDisabled(const std::string& feature);
 
  private:
   std::string public_key_;
+  std::set<std::string> disabled_features_;
 
   DISALLOW_COPY_AND_ASSIGN(OriginTrialKeyManager);
 };
 
 #endif  // CHROME_RENDERER_ORIGIN_TRIALS_ORIGIN_TRIAL_KEY_MANAGER_H_