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This is a reland of b02a397f

Original change's description:
> [fuchsia] Register Views with Fuchsia Accessibility APIs
> 
> * Add the AccessibilityBridge class skeleton, which will eventually
> handle the logic for conversion between Chromium and Fuchsia
> accessibility data structures.
> * Register a ViewRef to the Fuchsia SemanticsManager.
> 
> Test: Added AccessibilityBridgeUnitTest.*
> 
> Bug: 973095
> Change-Id: Ie8eb6a8cdd68e0082d3479b9b1288f8aaa68a600
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1708043
> Commit-Queue: Sharon Yang <yangsharon@chromium.org>
> Reviewed-by: Sergey Ulanov <sergeyu@chromium.org>
> Reviewed-by: Wez <wez@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#693914}

Bug: 973095
Change-Id: Ia13e5f80383abe6d22f3e3049a07b6204861b400
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1796627Reviewed-by: Wez <wez@chromium.org>
Commit-Queue: Wez <wez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#695321}