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

chrome/common/extensions/docs/examples/howto/tab_shortcuts/manifest.json

Index: chrome/common/extensions/docs/examples/howto/tab_shortcuts/manifest.json
diff --git a/chrome/common/extensions/docs/examples/howto/tab_shortcuts/manifest.json b/chrome/common/extensions/docs/examples/howto/tab_shortcuts/manifest.json
new file mode 100644
index 0000000000000000000000000000000000000000..198ac7a54f7ca388f06dcd4a41bef64782623b2c
--- /dev/null
+++ b/chrome/common/extensions/docs/examples/howto/tab_shortcuts/manifest.json
@@ -0,0 +1,26 @@
+{
+  "name": "Tab Shortcuts",
+  "version": "1.0",
+  "description": "Allows pinning and duplication of tabs via keyboard shortcuts.",
+  "manifest_version": 2,
+  "background": {
+    "scripts": ["tab_shortcuts.js"],
+    "persistent": false
+  },
+  "commands": {
+    "toggle-pin-tab": {
+      "suggested_key": {
+        "default": "Ctrl+Shift+X",
+        "mac": "Command+Shift+X"
+      },
+      "description": "Toggles whether the current tab is pinned."
+    },
+    "duplicate-tab": {
+      "suggested_key": {
+        "default": "Ctrl+Shift+Z",
+        "mac": "Command+Shift+Z"
+      },
+      "description": "Duplicates the current tab."
+    }
+  }
+}