Add the extended reporting checkbox to the malware interstitial v3

chrome/browser/resources/safe_browsing/safe_browsing_v3.js

 // Copyright 2014 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.
 
 // Must match the commands handled by SafeBrowsingBlockingPage::CommandReceived.
 var SB_CMD_DO_REPORT = 'doReport';
 var SB_CMD_DONT_REPORT = 'dontReport';
 var SB_CMD_EXPANDED_SEE_MORE = 'expandedSeeMore';
 var SB_CMD_LEARN_MORE_2 = 'learnMore2';
 var SB_CMD_PROCEED = 'proceed';
 var SB_CMD_REPORT_ERROR = 'reportError';
 var SB_CMD_SHOW_DIAGNOSTIC = 'showDiagnostic';
 var SB_CMD_SHOW_PRIVACY = 'showPrivacy';
 var SB_CMD_TAKE_ME_BACK = 'takeMeBack';
 
 // Other constants defined in safe_browsing_blocking_page.cc.
 var SB_BOX_CHECKED = 'boxchecked';
 var SB_DISPLAY_CHECK_BOX = 'displaycheckbox';
+
+// This sets up the Extended Safe Browsing Reporting opt-in.
+function setupCheckbox() {
+  if (loadTimeData.getBoolean('ssl') || loadTimeData.getBoolean('phishing') ||
+      !loadTimeData.getBoolean(SB_DISPLAY_CHECK_BOX)) {
+    return;
+  }
+
+  $('opt-in-label').innerHTML = loadTimeData.getString('optInLink');
+  $('opt-in-checkbox').checked = loadTimeData.getBoolean(SB_BOX_CHECKED);
+  $('malware-opt-in').classList.remove('hidden');
+
+  $('opt-in-checkbox').addEventListener('click', function() {
+    sendCommand(
+        $('opt-in-checkbox').checked ? SB_CMD_DO_REPORT : SB_CMD_DONT_REPORT);
+  });
+}