[Origin Trials] Support updates of disabled token list

chrome/browser/component_updater/origin_trials_component_installer.cc

Index: chrome/browser/component_updater/origin_trials_component_installer.cc
diff --git a/chrome/browser/component_updater/origin_trials_component_installer.cc b/chrome/browser/component_updater/origin_trials_component_installer.cc
index 9378dcf407a9f57d51a0ed5fb55f0de104e04d0e..0396ce4df1a67ff276014e274a71a2b13bd2a4db 100644
--- a/chrome/browser/component_updater/origin_trials_component_installer.cc
+++ b/chrome/browser/component_updater/origin_trials_component_installer.cc
@@ -20,7 +20,7 @@
 
 // The client-side configuration for the origin trial framework can be
 // overridden by an installed component named 'OriginTrials' (extension id
-// kfoklmclfodeliojeaekpoflbkkhojea. This component currently consists of just a
+// llkgjffcdpffmhiakmfcdcblohccpfmo. This component currently consists of just a
 // manifest.json file, which can contain a custom key named 'origin-trials'. The
 // value of this key is a dictionary:
 //
@@ -30,8 +30,6 @@
 //   "revoked-tokens": "<base64-encoded data>"
 // }
 //
-// TODO(iclelland): Implement support for revoked tokens.
-//
 // If the component is not present in the user data directory, the default
 // configuration will be used.
 
@@ -43,6 +41,8 @@ static const char kManifestOriginTrialsKey[] = "origin-trials";
 static const char kManifestPublicKeyPath[] = "origin-trials.public-key";
 static const char kManifestDisabledFeaturesPath[] =
     "origin-trials.disabled-features";
+static const char kManifestDisabledTokensPath[] =
+    "origin-trials.disabled-tokens";
 
 // Extension id is llkgjffcdpffmhiakmfcdcblohccpfmo
 const uint8_t kSha256Hash[] = {0xbb, 0xa6, 0x95, 0x52, 0x3f, 0x55, 0xc7, 0x80,
@@ -101,6 +101,15 @@ void OriginTrialsComponentInstallerTraits::ComponentReady(
   } else {
     local_state->ClearPref(prefs::kOriginTrialDisabledFeatures);
   }
+  base::ListValue* disabled_tokens_list = nullptr;
+  const bool manifest_has_disabled_tokens =
+      manifest->GetList(kManifestDisabledTokensPath, &disabled_tokens_list);
+  if (manifest_has_disabled_tokens && !disabled_tokens_list->empty()) {
+    ListPrefUpdate update(local_state, prefs::kOriginTrialDisabledTokens);
+    update->Swap(disabled_tokens_list);
+  } else {
+    local_state->ClearPref(prefs::kOriginTrialDisabledTokens);
+  }
 }
 
 base::FilePath OriginTrialsComponentInstallerTraits::GetRelativeInstallDir()