Add disabled origin trial feature 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 b8a2ec7d6896ffdcfafdb3638aa614b57530fc13..db361465cc5c85c905f7158706adaf3a9a43320a 100644
--- a/chrome/browser/component_updater/origin_trials_component_installer.cc
+++ b/chrome/browser/component_updater/origin_trials_component_installer.cc
@@ -13,6 +13,7 @@
 #include "chrome/common/chrome_switches.h"
 #include "components/component_updater/component_updater_paths.h"
 #include "components/prefs/pref_service.h"
+#include "components/prefs/scoped_user_pref_update.h"
 
 // The client-side configuration for the origin trial framework can be
 // overridden by an installed component named 'OriginTrials' (extension id
@@ -26,7 +27,7 @@
 //   "revoked-tokens": "<base64-encoded data>"
 // }
 //
-// TODO(iclelland): Implement support for revoked tokens and disabled features.
+// TODO(iclelland): Implement support for revoked tokens.
 //
 // If the component is not present in the user data directory, the default
 // configuration will be used.
@@ -76,6 +77,12 @@ void OriginTrialsComponentInstallerTraits::ComponentReady(
     local_state->Set("origin-trials.public-key",
                      base::StringValue(override_public_key));
   }
+  base::ListValue* override_disabled_feature_list;

[Sorin Jianu, 2016/06/07 17:20:24]

please initialize.

[iclelland, 2016/06/08 13:37:55]

Good catch, thanks. Done.

+  if (manifest->GetList("origin-trials.disabled-features",
+                        &override_disabled_feature_list)) {
+    ListPrefUpdate update(local_state, "origin-trials.disabled-features");

[chasej, 2016/06/07 15:51:31]

Use prefs::kOriginTrialDisabledFeatures constant?

[iclelland, 2016/06/08 13:37:55]

Done.

+    update->Swap(override_disabled_feature_list);
+  }
 }
 
 base::FilePath OriginTrialsComponentInstallerTraits::GetRelativeInstallDir()