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

chrome/renderer/resources/extension_process_bindings.js

Index: chrome/renderer/resources/extension_process_bindings.js
diff --git a/chrome/renderer/resources/extension_process_bindings.js b/chrome/renderer/resources/extension_process_bindings.js
index 3031d85313cff579002417df74af57b764b7875f..b109a764d9189b96d047cefeb9cb884cede65db8 100644
--- a/chrome/renderer/resources/extension_process_bindings.js
+++ b/chrome/renderer/resources/extension_process_bindings.js
@@ -64,6 +64,11 @@ var chromium;
 
   // 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);