These are the chords for Happy Little Pill; only the snippet he released in his video at Vidcon, 
but once the EP is released I think the rest of the song would be the same chord progression, 
maybe besides a bridge or something?

Troye's original is no capo, but you can use a capo to make it a suitable key for your voice.

                 G     
My happy little pill,
         D             
Take me away,
       Em             
Dry my eyes, 
      C                 
Bring colour to my skies.

                 G        
My sweet little pill,
       D               
Take my hunger,
       Em                 
But within, 
    C                
Numb my skin.