Add 'hidden' annotations tests pdfium/annots/

Originally https://codereview.chromium.org/2239713003/
Patch by tonikitoo@igalia.com

CL adds hidden annotation variants to the following existing
annotation tests:

(pdfium/annots/):
- annotation_circle_hidden.pdf
- annotation_ellipse_hidden.pdf
- annotation_highlight_hidden.pdf
- annotation_ink_hidden.pdf
- annotation_square_hidden.pdf
- annotation_squiggly_hidden.pdf
- annotation_strikeout_hidden.pdf
- annotation_underline_hidden.pdf

(fx/mulobj/new/text_markup/):
- new_textmarkup1_hidden.pdf
- new_textmarkup1_hidden.pdf.0.png
- new_textmarkup2_hidden.pdf
- new_textmarkup2_hidden.pdf.0.png
- new_textmarkup4_hidden.pdf
- new_textmarkup4_hidden.pdf.0.png
- new_textmarkup5_hidden.pdf
- new_textmarkup5_hidden.pdf.0.png
- new_textmarkup7_hidden.pdf
- new_textmarkup7_hidden.pdf.0.png
- new_textmarkup8_hidden.pdf
- new_textmarkup8_hidden.pdf.0.png

This is how each pdf test being added was generated:

1) uncompressed the PDF file with qpdf:

$ qpdf --stream-data=uncompress {pdf_file}.pdf {pdf_file}_hidden.pdf

2) editted {pdf_file}_hidden.pdf source manually changing
its "/F 4" entry to "/F 2".

3) compress {pdf_file}_hidden.pdf back with qpdf:

$ qpdf --stream-data=compress {pdf_file}_hidden.pdf {pdf_file}_hidden.pdf

Also, note that each PDF file added is accompanied of its own
*correct* expected result (png).
The behavior fix on PDFium side is happening in [1].

[1] https://codereview.chromium.org/2239853002

R=thestig@chromium.org

Review URL: https://codereview.chromium.org/2250543003 .
28 files changed
tree: 6c6c75b594395087685683382c7b19aac41576ee
  1. LICENSE
  2. codereview.settings
  3. fx/
  4. pdfium/
  5. third_party/
  6. xfa_specific/