Allow extensions on chrome:// URLs, when flag is set and permission is explicitly requested

chrome/browser/about_flags.cc

Index: chrome/browser/about_flags.cc
diff --git a/chrome/browser/about_flags.cc b/chrome/browser/about_flags.cc
index 9ef2d43cd91047a8c4bfc52bf2edce44eaf0b06d..ece80ab847482a036efc16b16bb98076530a2390 100644
--- a/chrome/browser/about_flags.cc
+++ b/chrome/browser/about_flags.cc
@@ -473,6 +473,13 @@ const Experiment kExperiments[] = {
     SINGLE_VALUE_TYPE(switches::kEnableExperimentalExtensionApis)
   },
   {
+    "extensions-on-chrome-urls",
+    IDS_FLAGS_EXTENSIONS_ON_CHROME_URLS_NAME,
+    IDS_FLAGS_EXTENSIONS_ON_CHROME_URLS_DESCRIPTION,
+    kOsAll,
+    SINGLE_VALUE_TYPE(switches::kExtensionsOnChromeURLs)
+  },
+  {
     "action-box",
     IDS_FLAGS_ACTION_BOX_NAME,
     IDS_FLAGS_ACTION_BOX_DESCRIPTION,
@@ -1616,6 +1623,7 @@ void FlagsState::ConvertFlagsToSwitches(
   for (size_t i = 0; i < num_experiments; ++i) {
     const Experiment& e = experiments[i];
     if (e.type == Experiment::SINGLE_VALUE) {
+      LOG(INFO) << "about to SetFlagToSwitchMapping for " << e.internal_name;
       SetFlagToSwitchMapping(e.internal_name, e.command_line_switch,
                              e.command_line_value, &name_to_switch_map);
     } else if (e.type == Experiment::MULTI_VALUE) {