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Links and images are sent in a vector from the plugin layer. This CL
uses the vectors sent to create link and image nodes, and adds them in
the PDFAccessibilityTree.

Tests have been added to validate PdfAccessibilityTree creation mocking
the data being sent from the plugin process.

End to end tests will be added in another CL as vectors of links and
images are not being populated as of right now. Once they are added in
the plugin layer then we can add tests for the same.

Bug: 981448
Change-Id: I5eecf643c0c50e0ec594e340344776f1f0d7a587
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1704718
Commit-Queue: Ankit Kumar 🌪️ <ankk@microsoft.com>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Reviewed-by: Kevin Babbitt <kbabbitt@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#691482}