Add tests for annotations.

Current expected files are not drawing annotations. It should be updated
as we enable drawing annotations.

R=thestig@chromium.org

Review URL: https://codereview.chromium.org/2144813003 .
diff --git a/pdfium/annots/annotation_circle.pdf b/pdfium/annots/annotation_circle.pdf
new file mode 100644
index 0000000..daea191
--- /dev/null
+++ b/pdfium/annots/annotation_circle.pdf
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diff --git a/pdfium/annots/annotation_circle_expected.pdf.0.png b/pdfium/annots/annotation_circle_expected.pdf.0.png
new file mode 100644
index 0000000..98742e1
--- /dev/null
+++ b/pdfium/annots/annotation_circle_expected.pdf.0.png
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diff --git a/pdfium/annots/annotation_freetext.pdf b/pdfium/annots/annotation_freetext.pdf
new file mode 100644
index 0000000..9c85a26
--- /dev/null
+++ b/pdfium/annots/annotation_freetext.pdf
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diff --git a/pdfium/annots/annotation_freetext_expected.pdf.0.png b/pdfium/annots/annotation_freetext_expected.pdf.0.png
new file mode 100644
index 0000000..4743b53
--- /dev/null
+++ b/pdfium/annots/annotation_freetext_expected.pdf.0.png
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diff --git a/pdfium/annots/annotation_highlight.pdf b/pdfium/annots/annotation_highlight.pdf
new file mode 100644
index 0000000..d7647dd
--- /dev/null
+++ b/pdfium/annots/annotation_highlight.pdf
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diff --git a/pdfium/annots/annotation_highlight_expected.pdf.0.png b/pdfium/annots/annotation_highlight_expected.pdf.0.png
new file mode 100644
index 0000000..cc9a762
--- /dev/null
+++ b/pdfium/annots/annotation_highlight_expected.pdf.0.png
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diff --git a/pdfium/annots/annotation_ink.pdf b/pdfium/annots/annotation_ink.pdf
new file mode 100644
index 0000000..ecae6d5
--- /dev/null
+++ b/pdfium/annots/annotation_ink.pdf
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diff --git a/pdfium/annots/annotation_ink_expected.pdf.0.png b/pdfium/annots/annotation_ink_expected.pdf.0.png
new file mode 100644
index 0000000..0baab7c
--- /dev/null
+++ b/pdfium/annots/annotation_ink_expected.pdf.0.png
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diff --git a/pdfium/annots/annotation_polygon.pdf b/pdfium/annots/annotation_polygon.pdf
new file mode 100644
index 0000000..12da189
--- /dev/null
+++ b/pdfium/annots/annotation_polygon.pdf
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diff --git a/pdfium/annots/annotation_polygon_expected.pdf.0.png b/pdfium/annots/annotation_polygon_expected.pdf.0.png
new file mode 100644
index 0000000..77d7a9c
--- /dev/null
+++ b/pdfium/annots/annotation_polygon_expected.pdf.0.png
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diff --git a/pdfium/annots/annotation_square.pdf b/pdfium/annots/annotation_square.pdf
new file mode 100644
index 0000000..1a00643
--- /dev/null
+++ b/pdfium/annots/annotation_square.pdf
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diff --git a/pdfium/annots/annotation_square_expected.pdf.0.png b/pdfium/annots/annotation_square_expected.pdf.0.png
new file mode 100644
index 0000000..d357536
--- /dev/null
+++ b/pdfium/annots/annotation_square_expected.pdf.0.png
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diff --git a/pdfium/annots/annotation_squiggly.pdf b/pdfium/annots/annotation_squiggly.pdf
new file mode 100644
index 0000000..7441184
--- /dev/null
+++ b/pdfium/annots/annotation_squiggly.pdf
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diff --git a/pdfium/annots/annotation_squiggly_expected.pdf.0.png b/pdfium/annots/annotation_squiggly_expected.pdf.0.png
new file mode 100644
index 0000000..a5add2b
--- /dev/null
+++ b/pdfium/annots/annotation_squiggly_expected.pdf.0.png
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diff --git a/pdfium/annots/annotation_stamp.pdf b/pdfium/annots/annotation_stamp.pdf
new file mode 100644
index 0000000..75b13d1
--- /dev/null
+++ b/pdfium/annots/annotation_stamp.pdf
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diff --git a/pdfium/annots/annotation_stamp_expected.pdf.0.png b/pdfium/annots/annotation_stamp_expected.pdf.0.png
new file mode 100644
index 0000000..15ecc2d
--- /dev/null
+++ b/pdfium/annots/annotation_stamp_expected.pdf.0.png
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diff --git a/pdfium/annots/annotation_strikeout.pdf b/pdfium/annots/annotation_strikeout.pdf
new file mode 100644
index 0000000..47ffa1a
--- /dev/null
+++ b/pdfium/annots/annotation_strikeout.pdf
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diff --git a/pdfium/annots/annotation_strikeout_expected.pdf.0.png b/pdfium/annots/annotation_strikeout_expected.pdf.0.png
new file mode 100644
index 0000000..8f40ed9
--- /dev/null
+++ b/pdfium/annots/annotation_strikeout_expected.pdf.0.png
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diff --git a/pdfium/annots/annotation_text.pdf b/pdfium/annots/annotation_text.pdf
new file mode 100644
index 0000000..e35e7b7
--- /dev/null
+++ b/pdfium/annots/annotation_text.pdf
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diff --git a/pdfium/annots/annotation_text_expected.pdf.0.png b/pdfium/annots/annotation_text_expected.pdf.0.png
new file mode 100644
index 0000000..d3b27f1
--- /dev/null
+++ b/pdfium/annots/annotation_text_expected.pdf.0.png
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diff --git a/pdfium/annots/annotation_underline.pdf b/pdfium/annots/annotation_underline.pdf
new file mode 100644
index 0000000..f11e452
--- /dev/null
+++ b/pdfium/annots/annotation_underline.pdf
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diff --git a/pdfium/annots/annotation_underline_expected.pdf.0.png b/pdfium/annots/annotation_underline_expected.pdf.0.png
new file mode 100644
index 0000000..2a75c63
--- /dev/null
+++ b/pdfium/annots/annotation_underline_expected.pdf.0.png
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