First CL for the about:policy page. This only implements the policy section of the page.

chrome/browser/resources/policy.js

Index: chrome/browser/resources/policy.js
diff --git a/chrome/browser/resources/policy.js b/chrome/browser/resources/policy.js
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+++ b/chrome/browser/resources/policy.js
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+// Copyright (c) 2011 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.
+
+var localStrings = new LocalStrings();
+
+/**
+ * This variable structure is here to document the structure that the template
+ * expects to correctly populate the page.
+ */
+var policyDataformat = {
+  'policies': [
+    {
+      'level': 'managed',
+      'name': 'AllowXYZ',
+      'set': true,
+      'sourceType': 'Device',
+      'status': 'ok',
+      'value': true,
+    },
+  ],
+  'anyPoliciesSet': true
+};
+
+cr.define('policies', function() {
+
+  function Policy() {
+  }
+
+  cr.addSingletonGetter(Policy);
+
+  Policy.prototype = {
+
+    /**
+     * True if none of the received policies are actually set, false otherwise.
+     * @type {boolean}
+     */
+    noActivePolicies_: false,
+
+    /**
+     * The current search term for filtering of the policy table.
+     * @type {string}
+     * @private
+     */
+    searchTerm_: '',
+
+    /**
+     * Takes the |policyData| input argument which represents data about the
+     * policies supported by the device/client and populates the html jstemplate
+     * with that data. It expects an object structure like the above.
+     * @param {Object} policyData Detailed info about policies
+     */
+    renderTemplate: function(policyData) {
+      this.noActivePolicies_ = !policyData.anyPoliciesSet;
+
+      // This is the javascript code that processes the template:
+      var input = new JsEvalContext(policyData);
+      var output = $('policiesTemplate');
+      jstProcess(input, output);
+    },
+
+    /**
+     * Filters the table of policies by name.
+     * @param {string} term The search string
+     */
+    filterTable: function(term) {
+      this.searchTerm_ = term.toLowerCase();
+      var table = $('policy-table');
+      var showUnsent = $('toggle-unsent-policies').checked;
+      for (var r = 1; r < table.rows.length; r++) {
+        var row = table.rows[r];
+
+        // Don't change visibility of policies that aren't set if the checkbox
+        // isn't checked.
+        if (!showUnsent && row.className == 'policy-unset')
+          continue;
+
+        var nameCell = row.querySelector('.policy-name');
+        var cellContents = nameCell.textContent;
+        if (cellContents.toLowerCase().indexOf(this.searchTerm_) >= 0)
+          row.style.display = 'table-row';
+        else
+          row.style.display = 'none';
+      }
+    },
+
+    /**
+     * Updates the visibility of the policies depending on the state of the
+     * 'toggle-unsent-policies' checkbox.
+     */
+    updatePolicyVisibility: function() {
+      if ($('toggle-unsent-policies').checked)
+          $('policies').style.display = '';
+      else if (this.noActivePolicies_)
+          $('policies').style.display = 'none';
+
+      var tableRows = document.getElementsByClassName('policy-unset');
+      for (var i = 0; i < tableRows.length; i++) {
+        if ($('toggle-unsent-policies').checked)
+          tableRows[i].style.visibility = 'visible';
+        else
+          tableRows[i].style.visibility = 'hidden';
+      }
+
+      // Filter table again in case a search was active.
+      this.filterTable(this.searchTerm_);
+    }
+  };
+
+  /**
+   * Asks the C++ PolicyUIHandler to get details about policies. The
+   * PolicyDOMHandler should reply to returnPolicyData() (below).
+   */
+  Policy.requestPolicyData = function() {
+    chrome.send('requestPolicyData');
+  };
+
+  /**
+   * Called by the C++ PolicyUIHandler when it has the requested policy data.
+   */
+  Policy.returnPolicyData = function(policyData) {
+    Policy.getInstance().renderTemplate(policyData);
+  };
+
+  /**
+   * Determines whether a policy should be visible or not.
+   * @param {policy} policy information in the format given by above the
+   * PolicyDataFormat
+   */
+  Policy.shouldDisplayPolicy = function(policy) {
+    return $('toggle-unsent-policies').checked || policy.set;
+  };
+
+  /**
+   * Initializes the page and loads the list of policies.
+   */
+  Policy.initialize = function() {
+    i18nTemplate.process(document, templateData);
+    Policy.requestPolicyData();
+
+    // Set HTML event handlers.
+    $('toggle-unsent-policies').onchange = function(event) {
+      Policy.getInstance().updatePolicyVisibility();
+    };
+
+    $('search-field').onsearch = function(event) {
+      Policy.getInstance().filterTable(this.value);
+    };
+  };
+
+  // Export
+  return {
+    Policy: Policy
+  };
+});
+
+var Policy = policies.Policy;
+
+// Get data and have it displayed upon loading.
+document.addEventListener('DOMContentLoaded', policies.Policy.initialize);