Implementation of the Extension Activity Log UI behind a flag.

chrome/browser/resources/options/extension_list.js

Index: chrome/browser/resources/options/extension_list.js
diff --git a/chrome/browser/resources/options/extension_list.js b/chrome/browser/resources/options/extension_list.js
index 5cbad97d5c538d2d7e78b6919cb8e7c123cd53bb..ca25276f7af9cc17bb4519f66a9afaa1ef96152f 100644
--- a/chrome/browser/resources/options/extension_list.js
+++ b/chrome/browser/resources/options/extension_list.js
@@ -222,6 +222,15 @@ cr.define('options', function() {
           vbox.appendChild(link);
         }
 
+        if (extension.allow_activity) {
+          var link = this.ownerDocument.createElement('a');
+          link.classList.add('extension-links-trailing');
+          link.textContent =
+              localStrings.getString('extensionSettingsActivity');
+          link.href = 'chrome://extension-activity?extensionId=' + extension.id;
+          vbox.appendChild(link);
+        }
+
         // Then the optional Visit Website link.
         if (extension.homepageUrl) {
           var link = this.ownerDocument.createElement('a');