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This CL adds a test for validating the paragraph and heading support in
PDF accessibility pipeline. A single PDF has been added which has a
heading and multiple paragraphs.

Bug: 981448
Change-Id: I40fe2b958e29fba2c8e0d98de254c438ad6ea248
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1723851Reviewed-by: Kevin Babbitt <kbabbitt@microsoft.com>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Ankit Kumar 🌪️ <ankk@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#682167}