MD Settings: implement support for extension-controlled startup URLs

chrome/browser/extensions/api/settings_private/prefs_util.cc

Index: chrome/browser/extensions/api/settings_private/prefs_util.cc
diff --git a/chrome/browser/extensions/api/settings_private/prefs_util.cc b/chrome/browser/extensions/api/settings_private/prefs_util.cc
index e2f86c70b4afac37e0ece158ef55bd2981a117d3..d1c52cca455b66711dfa960f728f22a12e806867 100644
--- a/chrome/browser/extensions/api/settings_private/prefs_util.cc
+++ b/chrome/browser/extensions/api/settings_private/prefs_util.cc
@@ -696,12 +696,24 @@ const Extension* PrefsUtil::GetExtensionControllingPref(
   // corresponds with some indiciator that should be shown in the settings UI.
   if (pref_object.key == ::prefs::kHomePage)
     return GetExtensionOverridingHomepage(profile_);
+
+  if (pref_object.key == ::prefs::kRestoreOnStartup) {
+    int restore_on_startup;
+    CHECK(pref_object.value->GetAsInteger(&restore_on_startup));
+
+    if (restore_on_startup == SessionStartupPref::kPrefValueURLs)
+      return GetExtensionOverridingStartupPages(profile_);
+  }
+
   if (pref_object.key == ::prefs::kURLsToRestoreOnStartup)
     return GetExtensionOverridingStartupPages(profile_);
+
   if (pref_object.key == ::prefs::kDefaultSearchProviderEnabled)
     return GetExtensionOverridingSearchEngine(profile_);
+
   if (pref_object.key == proxy_config::prefs::kProxy)
     return GetExtensionOverridingProxy(profile_);
+
   return nullptr;
 }