This class can be used to create a content::WebContents that can be inspected
by the Chrome Dev Tools. This requires embedding applications to copy
content_shell.pak into their resource bundle.
Right now the dev tools are always docked to the bottom of the view; we don't
yet support undocking or changing the docked side.
Fixes#1.
We deduce the name of the application from the CFBundleName of the .app bundle
and use a path based on that. Similar logic should be implementable for other
platforms.
Fixes#3.