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When calling AXPosition::ToPositionWithAffinity() on a position with a
|container_object_| of type AXInlineTextBox, the position returned is
always in the parent node, the StaticText object. Think of it as
a modification from a relative position to an absolute position, based
in the StaticText object.

However, when an InlineTextBox object has siblings (i.e. the parent
node has multiple InlineTextBox children), the position returned is
only valid for the first non-empty child. This bug was due to the fact
that we wrongfully assumed that the text offset in the child object
would be the same as the text offset in the parent position. This is
only true for the first non-empty child.

This CL introduces a fix for this bug. Instead of creating a position
in the parent node at the exact same offset, we add to it the sum of
the previous siblings MaxTextOffset().
It also adds a unit test for this case.

Bug: 928948
Change-Id: I1b52c7506e726956bca8b2d41d5a33bee3a84597
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1846563Reviewed-by: Koji Ishii <kojii@chromium.org>
Reviewed-by: Nektarios Paisios <nektar@chromium.org>
Commit-Queue: Benjamin Beaudry <benjamin.beaudry@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#707817}