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This is the first patch resulting from splitting
into multiple patches.

The CreateBoundaryStartPosition and CreateBoundaryEndPosition methods
were re-written to work with boundaries that are not only at the beginning
or the end of specific nodes, but could also fall on a text offset
*within* a node.

This patch doesn't create any new publicly exposed functionality in AXPosition.

Even though all existing tests should be passing unmodified,
this patch has uncovered a bug on how we used to compute upstream affinity which has now been fixed.

A followup patch will re-write word navigation functionality to use the above two methods.
A second followup patch will introduce support for document markers in AXPosition.

R=kschmi@microsoft.com, aleventhal@chromium.org, ethavar@microsoft.com

https: //crrev.com/c/1874254/
Bug: 1008031
Change-Id: I1ed67028c950cda1226c3a1b9b732a8d5a2af036
Change-Id: I1ed67028c950cda1226c3a1b9b732a8d5a2af036
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1894159
Commit-Queue: Nektarios Paisios <nektar@chromium.org>
Reviewed-by: Aaron Leventhal <aleventhal@chromium.org>
Reviewed-by: Kurt Catti-Schmidt <kschmi@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#713509}