Update pdfium/annots/annotation_square_expected.pdf.0.png with actual square annotation.

Also, add test cases for square annotation with fill, opacity, dash border, and
negative border width.

R=thestig@chromium.org

Review URL: https://codereview.chromium.org/2216193002 .
diff --git a/pdfium/annots/annotation_square_dash.pdf b/pdfium/annots/annotation_square_dash.pdf
new file mode 100644
index 0000000..e57f6a7
--- /dev/null
+++ b/pdfium/annots/annotation_square_dash.pdf
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diff --git a/pdfium/annots/annotation_square_dash_expected.pdf.0.png b/pdfium/annots/annotation_square_dash_expected.pdf.0.png
new file mode 100644
index 0000000..47a3151
--- /dev/null
+++ b/pdfium/annots/annotation_square_dash_expected.pdf.0.png
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diff --git a/pdfium/annots/annotation_square_expected.pdf.0.png b/pdfium/annots/annotation_square_expected.pdf.0.png
index d357536..53c8360 100644
--- a/pdfium/annots/annotation_square_expected.pdf.0.png
+++ b/pdfium/annots/annotation_square_expected.pdf.0.png
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diff --git a/pdfium/annots/annotation_square_fill_negative_border.pdf b/pdfium/annots/annotation_square_fill_negative_border.pdf
new file mode 100644
index 0000000..6ec0140
--- /dev/null
+++ b/pdfium/annots/annotation_square_fill_negative_border.pdf
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diff --git a/pdfium/annots/annotation_square_fill_negative_border_expected.pdf.0.png b/pdfium/annots/annotation_square_fill_negative_border_expected.pdf.0.png
new file mode 100644
index 0000000..88f2dcc
--- /dev/null
+++ b/pdfium/annots/annotation_square_fill_negative_border_expected.pdf.0.png
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diff --git a/pdfium/annots/annotation_square_fill_opacity.pdf b/pdfium/annots/annotation_square_fill_opacity.pdf
new file mode 100644
index 0000000..16a1e85
--- /dev/null
+++ b/pdfium/annots/annotation_square_fill_opacity.pdf
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diff --git a/pdfium/annots/annotation_square_fill_opacity_dash.pdf b/pdfium/annots/annotation_square_fill_opacity_dash.pdf
new file mode 100644
index 0000000..8c0f287
--- /dev/null
+++ b/pdfium/annots/annotation_square_fill_opacity_dash.pdf
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diff --git a/pdfium/annots/annotation_square_fill_opacity_dash_expected.pdf.0.png b/pdfium/annots/annotation_square_fill_opacity_dash_expected.pdf.0.png
new file mode 100644
index 0000000..eb6f07f
--- /dev/null
+++ b/pdfium/annots/annotation_square_fill_opacity_dash_expected.pdf.0.png
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diff --git a/pdfium/annots/annotation_square_fill_opacity_expected.pdf.0.png b/pdfium/annots/annotation_square_fill_opacity_expected.pdf.0.png
new file mode 100644
index 0000000..d8540d2
--- /dev/null
+++ b/pdfium/annots/annotation_square_fill_opacity_expected.pdf.0.png
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