Implement the password edit UI.

chrome/test/data/webui/settings/settings_passwords_section_browsertest.js

Index: chrome/test/data/webui/settings/settings_passwords_section_browsertest.js
diff --git a/chrome/test/data/webui/settings/settings_passwords_section_browsertest.js b/chrome/test/data/webui/settings/settings_passwords_section_browsertest.js
index 5cc6d8fc46d69087c0aa883bd347c1c94e2ac90e..6ba6a8999ee7b2e80f8de6601b04c3d436e2c7e8 100644
--- a/chrome/test/data/webui/settings/settings_passwords_section_browsertest.js
+++ b/chrome/test/data/webui/settings/settings_passwords_section_browsertest.js
@@ -112,10 +112,7 @@ SettingsPasswordSectionBrowserTest.prototype = {
     passwordsSection.savedPasswords = passwordList;
     passwordsSection.passwordExceptions = exceptionList;
     document.body.appendChild(passwordsSection);
-
-    // Allow polymer binding to finish.
-    Polymer.dom.flush();
-
+    this.flush_(passwordsSection);
     return passwordsSection;
   },
 
@@ -131,6 +128,17 @@ SettingsPasswordSectionBrowserTest.prototype = {
     }
     return false;
   },
+
+  /**
+   * Allow the iron-list to be sized properly.
+   * @param {!Object} passwordsSection
+   * @private
+   */
+  flush_: function(passwordsSection) {
+    passwordsSection.$.passwordList.notifyResize();
+    passwordsSection.$.passwordExceptionsList.notifyResize();
+    Polymer.dom.flush();
+  },
 };
 
 /**
@@ -178,7 +186,7 @@ TEST_F('SettingsPasswordSectionBrowserTest', 'uiTests', function() {
           passwordList);
       // Simulate 'longwebsite.com' being removed from the list.
       passwordsSection.splice('savedPasswords', 1, 1);
-      Polymer.dom.flush();
+      self.flush_(passwordsSection);
 
       assertFalse(self.listContainsUrl(passwordsSection.savedPasswords,
                                        'longwebsite.com'));
@@ -280,7 +288,7 @@ TEST_F('SettingsPasswordSectionBrowserTest', 'uiTests', function() {
       passwordsSection.splice('passwordExceptions', 1, 1);
       assertEquals(-1, passwordsSection.passwordExceptions.indexOf('mail.com'));
       assertEquals(-1, exceptionList.indexOf('mail.com'));
-      Polymer.dom.flush();
+      self.flush_(passwordsSection);
 
       self.validateExceptionList_(
           self.getIronListChildren_(passwordsSection.$.passwordExceptionsList),