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An accessible node that represents generated content (e.g., the ::before
selector) is completely ignored in AXNodePosition::MaxTextOffset and
AXNodePosition::GetText. Both methods return the
ax::mojom::StringAttribute::kValue's length and value, respectively.
Since this attribute's value doesn't include the value of the generated
content (because this generated content is either before or after the
main content of the text field), we return a wrong maximum text offset
and text.

To fix this, we should only use ax::mojom::StringAttribute::kValue's
length and value when the node has no child. When a node has a child, we
need to compute the maximum text offset by summing the maximum text
offset values of all of its children. The same applies for
AXNodePosition::GetText.

Bug: 928948
Change-Id: I624779a3e372d19ac2036de09fe9dbf1c4892867
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2037965
Commit-Queue: Benjamin Beaudry <benjamin.beaudry@microsoft.com>
Reviewed-by: Nektarios Paisios <nektar@chromium.org>
Reviewed-by: Kurt Catti-Schmidt <kschmi@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#739228}