Cloned from issue http://codereview.chromium.org/5277004/ by rogerta@chromium...

ceee/firefox/content/tab_api.js

 // Copyright (c) 2010 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 This file contains the implementation of the Chrome extension
  * tab APIs for the CEEE Firefox add-on.  This file is loaded by the
  * overlay.xul file, and requires that overlay.js has already been loaded.
  *
  * @supported Firefox 3.x
@@ skipping 240 matching lines @@
       CEEE_globals.MAIN_BROWSER_ID);
   if (!mainBrowser) {
     throw(new Error(CEEE_tabs_internal_.CMD_GET_SELECTED_TAB +
                     ': cannot find main browser win id=' + id));
   }
 
   var tab = mainBrowser.selectedTab;
   return this.buildTabValue(mainBrowser, tab);
 };
 
+CEEE_tabs_internal_.CMD_GET_CURRENT_TAB = 'tabs.getCurrent';
+CEEE_tabs_internal_.getCurrentTab_ = function(cmd, data) {
+  // TODO(rogerta@chromium.org): Revisit this implementation.  I'm not sure
+  // it strictly obeys the chrome extension API spec.
+  var cfTab = data.tab;
+  if (cfTab) {
+    var win = CEEE_mozilla_windows.findWindowFromCfSessionId(cfTab.id);
+    if (win) {
+      var mainBrowser = win.document.getElementById(
+          CEEE_globals.MAIN_BROWSER_ID);
+      var tab = mainBrowser.selectedTab;
+      return this.buildTabValue(mainBrowser, tab);
+    }
+  }
+};
+
 CEEE_tabs_internal_.CMD_GET_ALL_TABS_IN_WINDOW = 'tabs.getAllInWindow';
 CEEE_tabs_internal_.getAllTabsInWindow_ = function(cmd, data) {
   var args = CEEE_json.decode(data.args);
   var id = args[0];
   var win = CEEE_mozilla_windows.findWindow(id);
   if (!win || !win.document) {
     throw(new Error(CEEE_tabs_internal_.CMD_GET_ALL_TABS_IN_WINDOW +
                     ': invalid window id=' + id));
   }
 
@@ skipping 177 matching lines @@
   */
 function CEEE_initialize_tabs(ceeeInstance) {
   CEEE_tabs_internal_.ceeeInstance_ = ceeeInstance;
   var tabs = CEEE_tabs_internal_;
   ceeeInstance.registerExtensionHandler(tabs.CMD_GET_TAB,
                                         tabs,
                                         tabs.getTab_);
   ceeeInstance.registerExtensionHandler(tabs.CMD_GET_SELECTED_TAB,
                                         tabs,
                                         tabs.getSelectedTab_);
+  ceeeInstance.registerExtensionHandler(tabs.CMD_GET_CURRENT_TAB,
+                                        tabs,
+                                        tabs.getCurrentTab_);
   ceeeInstance.registerExtensionHandler(tabs.CMD_GET_ALL_TABS_IN_WINDOW,
                                         tabs,
                                         tabs.getAllTabsInWindow_);
   ceeeInstance.registerExtensionHandler(tabs.CMD_CREATE_TAB,
                                         tabs,
                                         tabs.createTab_);
   ceeeInstance.registerExtensionHandler(tabs.CMD_UPDATE_TAB,
                                         tabs,
                                         tabs.updateTab_);
   ceeeInstance.registerExtensionHandler(tabs.CMD_MOVE_TAB,
                                         tabs,
                                         tabs.moveTab_);
   ceeeInstance.registerExtensionHandler(tabs.CMD_REMOVE_TAB,
                                         tabs,
                                         tabs.removeTab_);
   ceeeInstance.registerExtensionHandler(tabs.CMD_EXECUTE_SCRIPT,
                                         tabs,
                                         tabs.executeScript_);
   ceeeInstance.registerExtensionHandler(tabs.CMD_INSERT_CSS,
                                         tabs,
                                         tabs.insertCss_);
 
   return tabs;
 }