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 bdaa3f96e4e69a601c04cefcea135ed3dc2035c8..106827da2f619c00e401aa590bf69e300cb7b6ff 100644
--- a/chrome/browser/resources/extensions/extension_list.js
+++ b/chrome/browser/resources/extensions/extension_list.js
@@ -37,6 +37,7 @@
  *            kioskOnly: boolean,
  *            locationText: string,
  *            managedInstall: boolean,
+ *            recommendedInstall: boolean,

[Finnur, 2014/10/06 14:01:42]

It is pretty clear this list should be alphabetically ordered. :)

[binjin, 2014/10/06 18:48:47]

Done.

  *            manifestErrors: (Array.<RuntimeError>|undefined),
  *            name: string,
  *            offlineEnabled: boolean,
@@ -170,6 +171,8 @@ 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');
       }
@@ -395,7 +398,7 @@ cr.define('options', function() {
       }
 
       // Then the 'managed, cannot uninstall/disable' message.

[Finnur, 2014/10/06 14:01:42]

nit: This comment is out of date now, no?

[binjin, 2014/10/06 18:48:47]

I think the comment looks fine to me. It's not restrictive as 'cannot uninstall
and disable'.

-      if (extension.managedInstall) {
+      if (extension.managedInstall || extension.recommendedInstall) {
         node.querySelector('.managed-message').hidden = false;
       } else {
         if (extension.suspiciousInstall) {