Add more of the server-side plumbing for extension APIs. Also

chrome/renderer/resources/extension_process_bindings.js

 var chromium;
 (function() {
   if (!chromium)
     chromium = {};
 
   // callback handling
   var callbacks = [];
   chromium._dispatchCallback = function(callbackId, str) {
     // We shouldn't be receiving evil JSON unless the browser is owned, but just
     // to be safe, we sanitize it. This regex mania was borrowed from json2,
@@ skipping 46 matching lines @@
     if (callback) {
       native function GetNextCallbackId();
       callbackId = GetNextCallbackId();
       callbacks[callbackId] = callback;
     }
     request(sargs, callbackId);
   }
 
   // Tabs
   chromium.tabs = {};
+  // TODO(aa): This should eventually take an optional windowId param.
+  chromium.tabs.getTabsForWindow = function(callback) {
+    native function GetTabsForWindow();
+    sendRequest(GetTabsForWindow, null, callback);
+  };
   chromium.tabs.createTab = function(tab, callback) {
     native function CreateTab();
     sendRequest(CreateTab, tab, callback);
   };
 })();