It is time.

ui/accessibility/extensions/caretbrowsing/background.js

-// Copyright (c) 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.
-
-/**
- * @fileoverview Script that runs on the background page.
- */
-
-CONTENT_SCRIPTS = [
-  'accessibility_utils.js',
-  'traverse_util.js',
-  'caret_browsing.js'
-];
-
-/**
- * The class handling the Caret Browsing background page, which keeps
- * track of the current state, handles the browser action button, and
- * initializes the content script in all running tabs when the extension
- * is first loaded.
- * @constructor
- */
-var CaretBkgnd = function() {};
-
-/**
- * Flag indicating whether caret browsing is enabled. Global, applies to
- * all tabs simultaneously.
- * @type {boolean}
- */
-CaretBkgnd.isEnabled;
-
-/**
- * Change the browser action icon and tooltip based on the enabled state.
- */
-CaretBkgnd.setIcon = function() {
-  chrome.browserAction.setIcon(
-      {'path': CaretBkgnd.isEnabled ?
-               '../caret_19_on.png' :
-               '../caret_19.png'});
-  chrome.browserAction.setTitle(
-      {'title': CaretBkgnd.isEnabled ?
-                'Turn Off Caret Browsing (F7)' :
-                'Turn On Caret Browsing (F7)' });
-};
-
-/**
- * This is called when the extension is first loaded, so that it can be
- * immediately used in all already-open tabs. It's not needed for any
- * new tabs that open after that, the content script will be automatically
- * injected into any new tab.
- */
-CaretBkgnd.injectContentScripts = function() {
-  chrome.windows.getAll({'populate': true}, function(windows) {
-    for (var i = 0; i < windows.length; i++) {
-      var tabs = windows[i].tabs;
-      for (var j = 0; j < tabs.length; j++) {
-        for (var k = 0; k < CONTENT_SCRIPTS.length; k++) {
-          chrome.tabs.executeScript(
-              tabs[j].id,
-              {file: CONTENT_SCRIPTS[k], allFrames: true},
-              function(result) {
-                // Ignore.
-                chrome.runtime.lastError;
-              });
-        }
-      }
-    }
-  });
-};
-
-/**
- * Toggle caret browsing on or off, and update the browser action icon and
- * all open tabs.
- */
-CaretBkgnd.toggle = function() {
-  CaretBkgnd.isEnabled = !CaretBkgnd.isEnabled;
-  var obj = {};
-  obj['enabled'] = CaretBkgnd.isEnabled;
-  chrome.storage.sync.set(obj);
-  CaretBkgnd.setIcon();
-};
-
-/**
- * Initialize the background script. Set the initial value of the flag
- * based on the saved preference in localStorage, update the browser action,
- * inject into running tabs, and then set up communication with content
- * scripts in tabs. Also check for prefs updates (from the options page)
- * and send them to content scripts.
- */
-CaretBkgnd.init = function() {
-  chrome.storage.sync.get('enabled', function(result) {
-    CaretBkgnd.isEnabled = result['enabled'];
-    CaretBkgnd.setIcon();
-    CaretBkgnd.injectContentScripts();
-
-    chrome.browserAction.onClicked.addListener(function(tab) {
-      CaretBkgnd.toggle();
-    });
-  });
-
-  chrome.storage.onChanged.addListener(function() {
-    chrome.storage.sync.get('enabled', function(result) {
-      CaretBkgnd.isEnabled = result['enabled'];
-      CaretBkgnd.setIcon();
-    });
-  });
-};
-
-CaretBkgnd.init();