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This CL introduces a method PDFiumPage::PopulateTextFields() which
reads text form fields from the PDF document and stores relevant
information in a vector within PDFiumPage.

The CL also includes a new test file with sample text fields and a unit
test to validate the new method.

Bug: 1030242
Change-Id: I98a13e237e443f1703ac7b699cc4952cf21c5e10
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2024637
Commit-Queue: Mansi Awasthi <maawas@microsoft.com>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Reviewed-by: Kevin Babbitt <kbabbitt@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#745022}