GitLab

Adding an AccessibilityStateChanged method to CastService so
the browser process can notify any out-of-process (non
chrome renderers) that need to know of that state change.
Base implementation does nothing.  ChromecastService will
override this in a subsequent CL.

Bug: None
Change-Id: I4c85d7ec529906d11b9a469bda25d4fadc0ec5f9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1539790
Commit-Queue: Randy Rossi <rmrossi@chromium.org>
Reviewed-by: Alex Sakhartchouk <alexst@chromium.org>
Cr-Commit-Position: refs/heads/master@{#644434}