Chrome Version: 58.0.3029.18
OS: Chrome

What steps will reproduce the problem?
(1) Go to the login screen
(2) Enable ChromeVox
(3) Press Search + Right to navigate linearly through the various items 

Issues:
1) ChromeVox is now accessing and reading the image file names. These files have lengthy irrelevant names that often contain lots of numbers, which should not be read aloud. I think we should probably either add empty alt text here so that nothing is read for the image itself, or make sure that a proper image description is read (e.g. dog avatar), etc. 

2) On one of my accounts on the login screen, I notice that there's a yellow triangle with an exclamation mark in it indicating that I need to re-sig into that account, or that my info is out of date. That icon has no label though, so ChromeVox can't access it. We need to make sure that is accessible to the screenreader to convey that information in audio spoken feedback. 


Albert, who is a good owner for login screen UI?