Implement deletion of storage per site.

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

Index: chrome/browser/resources/settings/site_settings/website_usage_private_api.js
diff --git a/chrome/browser/resources/settings/site_settings/website_usage_private_api.js b/chrome/browser/resources/settings/site_settings/website_usage_private_api.js
index 99f8858b0ba25bbe447f6f3eda66c47fceb41201..31aa874a5b5f4d09fb14113df4717a426c7cc59f 100644
--- a/chrome/browser/resources/settings/site_settings/website_usage_private_api.js
+++ b/chrome/browser/resources/settings/site_settings/website_usage_private_api.js
@@ -16,6 +16,14 @@ Polymer({
       type: String,
       notify: true,
     },
+
+    /**
+     * The type of data used by the given website.
+     */
+    websiteStorageType: {
+      type: Number,
+      notify: true,
+    },
   },
 
   attached: function() {
@@ -26,6 +34,11 @@ Polymer({
   fetchUsageTotal: function(host) {
     settings.WebsiteUsagePrivateApi.fetchUsageTotal(host);
   },
+
+  /** @param {string} origin */
+  clearUsage: function(origin, type) {
+    settings.WebsiteUsagePrivateApi.clearUsage(origin, type);
+  },
 });
 })();
 
@@ -60,17 +73,30 @@ cr.define('settings.WebsiteUsagePrivateApi', function() {
    * @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]);
   };
 
   return { websiteUsagePolymerInstance: websiteUsagePolymerInstance,
            fetchUsageTotal: fetchUsageTotal,
-           returnUsageTotal: returnUsageTotal };
+           returnUsageTotal: returnUsageTotal,
+           clearUsage: clearUsage, };
 });