** Try Polynesian Keyboard first, use this if Polynesian Keyboard doesn't work on the site you are trying to use it on.
https://chrome.google.com/webstore/detail/polynesian-keyboard/mjffedinmmdbebmljeoobdiccmoldidg
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This extension provides a popup that allows you to enter text using the Hawaiian (Poynesian) characters, the vowels with macrons as well as the proper okina or glottal stop character.
alt + <vowel> key combination to enter the vowel w/macron
Double tapping the shift THEN hitting a vowel will get you an uppercase vowel w/macron:
shift, shift THEN <vowel>
alt + ' will get you the glottal stop character or ‘okina
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