Do not assign launch ordinals to ephemeral apps

chrome/browser/extensions/chrome_app_sorting.cc

Index: chrome/browser/extensions/chrome_app_sorting.cc
diff --git a/chrome/browser/extensions/chrome_app_sorting.cc b/chrome/browser/extensions/chrome_app_sorting.cc
index c96ae099db93950475ce0ab547884d7f130c53f0..d7819310997f4ec4eb5884f392b8c4c35e7f9e9a 100644
--- a/chrome/browser/extensions/chrome_app_sorting.cc
+++ b/chrome/browser/extensions/chrome_app_sorting.cc
@@ -435,8 +435,12 @@ syncer::StringOrdinal ChromeAppSorting::PageIntegerAsStringOrdinal(
   return ntp_ordinal_map_.rbegin()->first;
 }
 
-void ChromeAppSorting::MarkExtensionAsHidden(const std::string& extension_id) {
-  ntp_hidden_extensions_.insert(extension_id);
+void ChromeAppSorting::SetExtensionVisible(const std::string& extension_id,
+                                           bool visible) {
+  if (visible)
+    ntp_hidden_extensions_.erase(extension_id);
+  else
+    ntp_hidden_extensions_.insert(extension_id);
 }
 
 syncer::StringOrdinal ChromeAppSorting::GetMinOrMaxAppLaunchOrdinalsOnPage(