Implement deletion of storage per site.

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

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 (function() {
 'use strict';
 
 Polymer({
   is: 'website-usage-private-api',
 
   properties: {
     /**
      * The amount of data used by the given website.
      */
     websiteDataUsage: {
       type: String,
       notify: true,
     },
+
+    /**
+     * The type of data used by the given website.
+     */
+    websiteStorageType: {
+      type: Number,
+      notify: true,
+    },
   },
 
   attached: function() {
     settings.WebsiteUsagePrivateApi.websiteUsagePolymerInstance = this;
   },
 
   /** @param {string} host */
   fetchUsageTotal: function(host) {
     settings.WebsiteUsagePrivateApi.fetchUsageTotal(host);
   },
+
+  /** @param {string} origin */

[michaelpg, 2016/02/04 19:18:01]

add type param

+  clearUsage: function(origin, type) {
+    settings.WebsiteUsagePrivateApi.clearUsage(origin, type);
+  },
+
+  notifyUsageDeleted: function(origin) {

[michaelpg, 2016/02/04 19:18:01]

nit: @param

+    this.fire('usage-deleted', {origin: origin});
+  },
 });
 })();
 
 cr.define('settings.WebsiteUsagePrivateApi', function() {
   /**
    * @type {Object} An instance of the polymer object defined above.
    * All data will be set here.
    */
   var websiteUsagePolymerInstance = null;
 
@@ skipping 14 matching lines @@
 
     hostName_ = host;
     chrome.send('fetchUsageTotal', [host]);
   };
 
   /**
    * Callback for when the usage total is known.
    * @param {string} host The host that the usage was fetched for.
    * @param {string} usage The string showing how much data the given host
    *     is using.
+   * @param {number} type The storage type.
    */
-  var returnUsageTotal = function(host, usage) {
+  var returnUsageTotal = function(host, usage, type) {
     var instance = settings.WebsiteUsagePrivateApi.websiteUsagePolymerInstance;
     if (instance == null)
       return;
 
-    if (hostName_ == host)
+    if (hostName_ == host) {
       instance.websiteDataUsage = usage;
+      instance.websiteStorageType = type;
+    }
+  };
+
+  /**
+   * Deletes the storage being used for a given origin.
+   * @param {string} origin The origin to delete storage for.
+   * @param {number} type The type of storage to delete.
+   */
+  var clearUsage = function(origin, type) {
+    chrome.send('clearUsage', [origin, type]);
+  };
+
+  /**
+   * Callback for when the usage has been cleared.
+   * @param {string} origin The origin that the usage was fetched for.
+   */
+  var onUsageCleared = function(origin) {
+    var instance = settings.WebsiteUsagePrivateApi.websiteUsagePolymerInstance;
+    if (instance == null)
+      return;
+
+    instance.notifyUsageDeleted(origin);
   };
 
   return { websiteUsagePolymerInstance: websiteUsagePolymerInstance,
            fetchUsageTotal: fetchUsageTotal,
-           returnUsageTotal: returnUsageTotal };
+           returnUsageTotal: returnUsageTotal,
+           clearUsage: clearUsage,
+           onUsageCleared: onUsageCleared, };
 });