Notify users about certain changes in installed extensions.

chrome/common/pref_names.cc

Index: chrome/common/pref_names.cc
diff --git a/chrome/common/pref_names.cc b/chrome/common/pref_names.cc
index 570ae7210874445d5f53d33d674c29983d69d269..c36942e2a1f56b2b3fea99cc74bfdc663ed39fea 100644
--- a/chrome/common/pref_names.cc
+++ b/chrome/common/pref_names.cc
@@ -1188,6 +1188,10 @@ const char kExtensionInstallAllowList[] = "extensions.install.allowlist";
 // Google controlled.
 const char kExtensionInstallDenyList[] = "extensions.install.denylist";
 
+// Whether we have run the extension-alert system (see ExtensionGlobalError)
+// at least once for this profile.
+const char kExtensionAlertsInitializedPref[] = "extensions.alerts.initialized";
+
 // A list containing extensions that Chrome will silently install
 // at startup time. It is a list of strings, each string contains
 // an extension ID and an update URL, delimited by a semicolon.