Add recommended extension installation support

chrome/browser/resources/extensions/extension_list.js

Index: chrome/browser/resources/extensions/extension_list.js
diff --git a/chrome/browser/resources/extensions/extension_list.js b/chrome/browser/resources/extensions/extension_list.js
index 12a0d4b73339a6f57a5b44e83d1e45f5b2f00026..e0debe03346535a96a49a967dca1d9c39f5b2eb6 100644
--- a/chrome/browser/resources/extensions/extension_list.js
+++ b/chrome/browser/resources/extensions/extension_list.js
@@ -36,6 +36,7 @@
  *            kioskOnly: boolean,
  *            locationText: string,
  *            managedInstall: boolean,
+ *            recommendedInstall: boolean,
  *            manifestErrors: (Array.<RuntimeError>|undefined),
  *            name: string,
  *            offlineEnabled: boolean,
@@ -168,6 +169,8 @@ cr.define('options', function() {
           extension.dependentExtensions.length > 0) {
         node.classList.add('may-not-modify');
         node.classList.add('may-not-remove');
+      } else if (extension.recommendedInstall) {
+        node.classList.add('may-not-remove');
       } else if (extension.suspiciousInstall || extension.corruptInstall) {
         node.classList.add('may-not-modify');
       }
@@ -387,7 +390,7 @@ cr.define('options', function() {
       }
 
       // Then the 'managed, cannot uninstall/disable' message.
-      if (extension.managedInstall) {
+      if (extension.managedInstall || extension.recommendedInstall) {
         node.querySelector('.managed-message').hidden = false;
       } else {
         if (extension.suspiciousInstall) {