Created a sample extension that shows off event pages, new tab apis, and keyboard shortcuts.

chrome/common/extensions/docs/examples/howto/tab_shortcuts/tab_shortcuts.js

Index: chrome/common/extensions/docs/examples/howto/tab_shortcuts/tab_shortcuts.js
diff --git a/chrome/common/extensions/docs/examples/howto/tab_shortcuts/tab_shortcuts.js b/chrome/common/extensions/docs/examples/howto/tab_shortcuts/tab_shortcuts.js
new file mode 100644
index 0000000000000000000000000000000000000000..4ff711f9ef75be33c52219a0231260d002444516
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+++ b/chrome/common/extensions/docs/examples/howto/tab_shortcuts/tab_shortcuts.js
@@ -0,0 +1,18 @@
+// Copyright (c) 2013 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.
+
+/**
+ * Register a callback function with the commands api, which will be called when
+ * one of our registered commands is detected.
+ */
+chrome.commands.onCommand.addListener(function(command) {
+  // Call 'update' with an empty properties object to get access to the current
+  // tab (given to us in the callback function).
+  chrome.tabs.update({}, function(tab) {
+    if (command == 'toggle-pin-tab')
+      chrome.tabs.update({pinned: !tab.pinned});
+    else if (command == 'duplicate-tab')
+      chrome.tabs.duplicate(tab.id);
+  });
+});