[MD settings] show icon when content settings are controlled by an extension

ui/webui/resources/cr_elements/policy/cr_policy_pref_behavior.js

Index: ui/webui/resources/cr_elements/policy/cr_policy_pref_behavior.js
diff --git a/ui/webui/resources/cr_elements/policy/cr_policy_pref_behavior.js b/ui/webui/resources/cr_elements/policy/cr_policy_pref_behavior.js
index 0fd367c6238f3417266d038abf570cd81053fef5..064af8e2fac4876bf149379542dfb7ab1a47aadb 100644
--- a/ui/webui/resources/cr_elements/policy/cr_policy_pref_behavior.js
+++ b/ui/webui/resources/cr_elements/policy/cr_policy_pref_behavior.js
@@ -9,12 +9,13 @@
 /** @polymerBehavior */
 var CrPolicyPrefBehavior = {
   /**
+   * Is the |pref| controlled by something that prevents user control of the
+   * preference.
    * @param {!chrome.settingsPrivate.PrefObject} pref
-   * @return {boolean} True if the pref is controlled by an enforced policy.
+   * @return {boolean} True if the pref is enforced.
    */
-  isPrefPolicyControlled: function(pref) {
-    return pref.enforcement == chrome.settingsPrivate.Enforcement.ENFORCED &&
-        pref.controlledBy != chrome.settingsPrivate.ControlledBy.EXTENSION;
+  isPrefEnforced: function(pref) {
+    return pref.enforcement == chrome.settingsPrivate.Enforcement.ENFORCED;
   },
 
   /**
@@ -36,6 +37,8 @@ var CrPolicyPrefBehavior = {
           return CrPolicyIndicatorType.USER_POLICY;
         case chrome.settingsPrivate.ControlledBy.DEVICE_POLICY:
           return CrPolicyIndicatorType.DEVICE_POLICY;
+        case chrome.settingsPrivate.ControlledBy.EXTENSION:
+          return CrPolicyIndicatorType.EXTENSION;

[Dan Beam, 2017/02/25 00:13:41]

please show me screenshots of situations like a <controlled-*> or <settings-*>
thing with a pref={{}} that also has a nearby <extension-controlled-indicator>
without duplicate indications (i.e. no puzzle piece and tooltip AND a "[Name] is
controlling this setting" inline UI right by eachother)

[dschuyler, 2017/02/28 00:15:18]

Done off-line.

       }
     }
     return CrPolicyIndicatorType.NONE;