With Perfect Guitar Song Book, you can easily starts web searches from the app’s add song dialog.
Thus, you just have to set a URL, that contains placeholders for title and/or artist as start URL of the built-in web browser in the app’s settings.
This starts a google search with the song’s artist, title and the word “chords” (If you have entered artist and title in the add song screen before)
Placeholders: %a will be replaced with the artist %t will be replaced with the title
Examples for search URLs: Just copy an URL from here and paste into the start URL field in PGSongBook’s settings.