MD Settings: Allow editing a cookie site exception.

chrome/browser/resources/settings/site_settings/site_list.html

 <link rel="import" href="chrome://resources/cr_elements/cr_action_menu/cr_action_menu.html">
 <link rel="import" href="chrome://resources/cr_elements/icons.html">
 <link rel="import" href="chrome://resources/html/polymer.html">
 <link rel="import" href="chrome://resources/html/web_ui_listener_behavior.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/iron-icon/iron-icon.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-icon-button/paper-icon-button.html">
 <link rel="import" href="../i18n_setup.html">
 <link rel="import" href="../icons.html">
 <link rel="import" href="../route.html">
 <link rel="import" href="../settings_shared_css.html">
 <link rel="import" href="add_site_dialog.html">
 <link rel="import" href="constants.html">
+<link rel="import" href="edit_exception_dialog.html">
 <link rel="import" href="site_settings_behavior.html">
 <link rel="import" href="site_settings_prefs_browser_proxy.html">
 
 <dom-module id="site-list">
   <template>
     <style include="settings-shared">
       paper-icon-button {
         left: 8px;
         right: 8px;
       }
@@ skipping 18 matching lines @@
         </button>
         <button class="dropdown-item" role="option" id="block"
             on-tap="onBlockTap_" hidden$="[[!showBlockAction_]]">
           $i18n{siteSettingsActionBlock}
         </button>
         <button class="dropdown-item" role="option" id="sessionOnly"
             on-tap="onSessionOnlyTap_"
             hidden$="[[!showSessionOnlyActionForSite_(actionMenuSite_)]]">
           $i18n{siteSettingsActionSessionOnly}
         </button>
+        <button class="dropdown-item" role="option" id="edit"
+            on-tap="onEditTap_" hidden$="[[!showEditAction_]]">
+          $i18n{edit}
+        </button>
         <button class="dropdown-item" role="option" id="reset"
             on-tap="onResetTap_">
           $i18n{siteSettingsActionReset}
         </button>
       </dialog>
 
       <div class="list-frame" hidden$="[[hasSites_(sites)]]">
         <div class="list-item secondary">$i18n{noSitesAdded}</div>
       </div>
       <div class="list-frame menu-content vertical-list" id="listContainer">
@@ skipping 25 matching lines @@
               <div on-tap="onOriginTap_" actionable>
                 <button class="subpage-arrow" is="paper-icon-button-light"
                     aria-label="[[item.displayName]]"
                     aria-describedby="siteDescription"></button>
               </div>
             </template>
           </div>
         </template>
       </div>
     </div>
+    <template is="dom-if" if="[[showEditExceptionDialog_]]" restamp>
+      <settings-edit-exception-dialog model="[[actionMenuSite_]]"
+          on-close="onEditExceptionDialogClosed_">
+      </settings-edit-exception-dialog>
+    </template>
   </template>
   <script src="site_list.js"></script>
 </dom-module>