App Version: 59.0.3032.0 canary
iOS Version: 10.3 beta 3, 10.2.1
Devices: iPhone 7, iPhone 6 plus, iPhone 7 plus 
URL: 

Precondition:
Device Settings -> General -> Accessibility -> VoiceOver -> On

Steps to reproduce:
  1.  Launch chrome 
  2.  Open any URL 
  3.  Chrome Menu --> Share --> Chrome Read later 

Observed results:
Voiceover do not read toast message “Add to reading list”

Expected results:
Voiceover should read toast message.

Number of times you were able to reproduce: 5/5
Bug reproducible after clean install: Yes
Bug reproducible after clearing cache and cookies: Yes
Bug reproducible on Chrome Mobile on Android: Not tested
Bug reproducible on Safari/Firefox: Firefox: NA, Safari: NA
Bug reproducible on current stable build (App Version, iOS Version): New feature on M57
Bug reproducible on the current beta channel build (App Version, iOS Version): No on M57, Yes on M58

Link to video/image: 

M59 - https://drive.google.com/a/google.com/file/d/0Bz2uwV55gGwDcG5Yd2VITUhuOFE/view?usp=sharing

M57 - https://drive.google.com/a/google.com/file/d/0Bz2uwV55gGwDZndZTmlrVnZHdVE/view?usp=sharing