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This CL adds scrolling when PDFiumEngine::HandleAccessibilityAction
is called with PP_PDF_SET_SELECTION and the selection is not
visible since Blink triggers also scrolling with setting selection.
So, this change makes PDF document scroll the page when a selection
is set.

AX-Relnotes: When SetSelection action is handled on pdf, it also
triggers scrolling if the selection is not in the visible area.
For instance, atk_text_set_caret_offset() on pdf scrolls the page
if the text is not in the view port.

Bug: 993456
Change-Id: I8323eff293b3216e2b862f8df3e896380b1c9945
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2573975Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Reviewed-by: K. Moon <kmoon@chromium.org>
Reviewed-by: Martin Robinson <mrobinson@igalia.com>
Commit-Queue: Julie Kim <jkim@igalia.com>
Cr-Commit-Position: refs/heads/master@{#835994}