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Currently, ToggleImageButton relies on the tooltip text to provide the
accessible name.

In some circumstances, we want a more explanatory AX name than the
tooltip text, and this is supported by the base Button class.

This CL expands ToggleImageButton to support a different AX name than
the tooltip text, in both toggled and untoggled states.

Bug: 1099788
Change-Id: Icfdcaac4ba50ba233e33663df74a0c32680bce07
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2292724
Auto-Submit: Tommy Li <tommycli@chromium.org>
Reviewed-by: Allen Bauer <kylixrd@chromium.org>
Commit-Queue: Tommy Li <tommycli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#788644}