Add disabled origin trial feature list

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
index f9daf477349c4dc4b37a825daa05560336ad6857..a2806f1891ab08d8ccd9dbe9eea29f124d1e4e5e 100644
--- a/chrome/common/origin_trials/origin_trial_key_manager.h
+++ b/chrome/common/origin_trials/origin_trial_key_manager.h
@@ -5,6 +5,7 @@
 #ifndef CHROME_COMMON_ORIGIN_TRIALS_ORIGIN_TRIAL_KEY_MANAGER_H_
 #define CHROME_COMMON_ORIGIN_TRIALS_ORIGIN_TRIAL_KEY_MANAGER_H_
 
+#include <set>
 #include <string>
 
 #include "base/macros.h"
@@ -19,9 +20,12 @@ class OriginTrialKeyManager {
 
   bool SetPublicKeyFromASCIIString(const std::string& ascii_public_key);
   base::StringPiece GetPublicKey() const;
+  bool SetDisabledFeatures(const std::string& disabled_feature_list);
+  bool IsFeatureDisabled(base::StringPiece feature) const;
 
  private:
   std::string public_key_;
+  std::set<std::string> disabled_features_;
 
   DISALLOW_COPY_AND_ASSIGN(OriginTrialKeyManager);
 };