Better support for patterns.

chrome/browser/resources/settings/site_settings/site_settings_behavior.js

Index: chrome/browser/resources/settings/site_settings/site_settings_behavior.js
diff --git a/chrome/browser/resources/settings/site_settings/site_settings_behavior.js b/chrome/browser/resources/settings/site_settings/site_settings_behavior.js
index 31310a6701ec141149b9e01dd3d19ae52b27bb97..e15c22119c977d4c201fc00bd1798b81db4f97ad 100644
--- a/chrome/browser/resources/settings/site_settings/site_settings_behavior.js
+++ b/chrome/browser/resources/settings/site_settings/site_settings_behavior.js
@@ -284,6 +284,16 @@ var SiteSettingsBehaviorImpl = {
         return '';
     }
   },
+
+  /**
+   * Ensures the URL has a scheme (assumes http if omitted).
+   * @param {string} url The URL with or without a scheme.
+   * @return {string} The URL with a scheme, or an empty string.
+   */
+  ensureUrlHasScheme: function(url) {
+    if (url.length == 0) return url;
+    return url.includes('://') ? url : 'http://' + url;
+  },
 };
 
 /** @polymerBehavior */