dart/editor/tools/plugins/com.google.dart.tools.core/src/com/google/dart/tools/core/generator/chrome/manifest.json

{
  "name": "{name.title}",
  "version": "1",
  
  "manifest_version": 2,
  
  "icons": {"128": "dart_icon.png"},
  
  "app": {
    "background": {
      "scripts": ["background.js"]
    }
  }
}