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This fix is needed to make touch work in the browser frame
when a screen reader is on. It consists in two main parts:
1. Apply the scale factor to the hit point received after touching
any element in the frame.
2. Add unit tests for the scale factor.

Bug: 990560
Change-Id: I00c3cd4de4ea49e8e8f881eb1db17c6a649b873c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1796888
Commit-Queue: Maria Villarreal <mavill@microsoft.com>
Reviewed-by: Nektarios Paisios <nektar@chromium.org>
Reviewed-by: Kevin Babbitt <kbabbitt@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#697399}