Add disabled origin trial feature list

chrome/browser/origin_trials/origin_trial_controller.h

Index: chrome/browser/origin_trials/origin_trial_controller.h
diff --git a/chrome/browser/origin_trials/origin_trial_controller.h b/chrome/browser/origin_trials/origin_trial_controller.h
index 695b0e54795c4f9d10c77a890b51e7b00f89b8fe..7a8d0ac3a23f8615220c44304cd9e9db076ba09a 100644
--- a/chrome/browser/origin_trials/origin_trial_controller.h
+++ b/chrome/browser/origin_trials/origin_trial_controller.h
@@ -13,11 +13,12 @@ class OriginTrialController {
  public:
   static const char kFieldTrialName[];
   static const char kPublicKeyFieldName[];
+  static const char kDisabledFeaturesFieldName[];
 
   // Updates the renderer command line to pass any relevant origin trial
   // configuration to the renderer at startup. Currently this can include an
-  // updated public key to use for validating tokens. This method is
-  // thread-safe.
+  // updated public key to use for validating tokens, and a list of experimental
+  // features to exclude from origin trials. This method is thread-safe.
   static void UpdateCommandLineFromFieldTrials(base::CommandLine* command_line);
 };