[Origin Trials] Support updates of disabled token list

chrome/common/chrome_switches.cc

Index: chrome/common/chrome_switches.cc
diff --git a/chrome/common/chrome_switches.cc b/chrome/common/chrome_switches.cc
index 49f6b5d95519744d9557a60cc5a2c3a0c90b560c..34bade85e04cdcd748737d57d9a40f9d0f3015d4 100644
--- a/chrome/common/chrome_switches.cc
+++ b/chrome/common/chrome_switches.cc
@@ -650,6 +650,10 @@ const char kOriginalProcessStartTime[]      = "original-process-start-time";
 // be disabled. Names should be separated by "|" characters.
 const char kOriginTrialDisabledFeatures[] = "origin-trial-disabled-features";
 
+// Contains a list of token signatures for which origin trial experiments should
+// be disabled. Tokens should be separated by "|" characters.
+const char kOriginTrialDisabledTokens[] = "origin-trial-disabled-tokens";
+
 // Overrides the default public key for checking origin trial tokens.
 const char kOriginTrialPublicKey[] = "origin-trial-public-key";