This kind of UI can be added to a production extension by injecting
arbitrary code into selected pages with a content script
<http://code.google.com/chrome/extensions/content_scripts.html> or
"chrome.tabs.executeScript"
<http://code.google.com/chrome/extensions/tabs.html#method-executeScript>.
> Also, Chrome display a banner in startup if Chrome is not a default
> browser on top of the page. Can I create that kind of banner/band
> using chrome extensions.
You can, with the experimental infobar API
<http://code.google.com/chrome/extensions/dev/experimental.infobars.html>.
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They're prototypes -- we aim to get feedback, improve them, and turn
the good parts into stable APIs. The history API, for example, started
out as an experimental API.