Implementation of the Extension Activity Log UI behind a flag.

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 0da6cc021db2ed7a59ed9b5d99bced339a55ebf7..e8bb8c172599ea79e1c493ba94383692edd844f0 100644
--- a/chrome/browser/resources/extensions/extension_list.js
+++ b/chrome/browser/resources/extensions/extension_list.js
@@ -147,6 +147,13 @@ cr.define('options', function() {
         e.preventDefault();
       });
 
+      if (extension.allow_activity) {
+        var activity = node.querySelector('.activity-link');
+        activity.href = 'chrome://extension-activity?extensionId=' +
+            extension.id;
+        activity.hidden = false;
+      }
+
       // The 'View in Web Store' checkbox.
       if (extension.homepageUrl) {
         var store = node.querySelector('.store-link');