Expose images to accessibility
Blink has some loose heuristics to ignore images, even ones that are important for interaction.
Specifically, web authors do use horizontal images (i.e. 1d images) to convey information to screen readers that is not purely presentational.
At the very least, it should be up to each client to make an intelligent determination.
This cl also adds missing graphics predicates and key bindings to ChromeVox.
BUG=
641848
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:closure_compilation
Committed:
https://crrev.com/32e424c9defb30fdf056cc48f1c90451f8c6c2a9
Cr-Commit-Position: refs/heads/master@{#430199}