GitLab

This is a reland of 9b07e5e0 with
a fix of a failure on Linux MSan Test builder.

Added an initial value for |action_data.target_rect| to
AccessibilityTest.TestSelectionActionHandling.

Original change's description:
> [a11y] Add scrolling action to PP_PDF_SET_SELECTION
>
> 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/+/2573975
> Reviewed-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}

Bug: 993456
Change-Id: Ie7c683d062c50d4eade2b5fb4990bc6ca2be12ba
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2586644Reviewed-by: K. Moon <kmoon@chromium.org>
Commit-Queue: Julie Kim <jkim@igalia.com>
Cr-Commit-Position: refs/heads/master@{#836377}