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http://crrev/c/1978202 fixed the scaling computation, but
ArcAccessibilityHelperBridge::OnGetTextLocationDataResult left
unchanged.
This method is used in Select-to-Speak to get text location, so we also
need to fix it.

This CL also refactors bounds computation and adds a new file geometry_util.

Bug: b:129680977
Test: manual. (ChromeVox, HighlightInputFocus and S2S with various scale)
Change-Id: I091d5a91e083d160b4c20af0529744b9b0613eec
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1980265
Commit-Queue: Hiroki Sato <hirokisato@chromium.org>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#729166}