Update pdfium/annots/annotation_ink_expected.pdf.0.png with actual ink annotation.

Also, add test cases with dash, dot, and multiple ink annotations.

R=thestig@chromium.org

Review URL: https://codereview.chromium.org/2224213004 .
diff --git a/pdfium/annots/annotation_ink_dash.pdf b/pdfium/annots/annotation_ink_dash.pdf
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diff --git a/pdfium/annots/annotation_ink_dash_expected.pdf.0.png b/pdfium/annots/annotation_ink_dash_expected.pdf.0.png
new file mode 100644
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+++ b/pdfium/annots/annotation_ink_dash_expected.pdf.0.png
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diff --git a/pdfium/annots/annotation_ink_dot.pdf b/pdfium/annots/annotation_ink_dot.pdf
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diff --git a/pdfium/annots/annotation_ink_dot_expected.pdf.0.png b/pdfium/annots/annotation_ink_dot_expected.pdf.0.png
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diff --git a/pdfium/annots/annotation_ink_expected.pdf.0.png b/pdfium/annots/annotation_ink_expected.pdf.0.png
index 0baab7c..5b88152 100644
--- a/pdfium/annots/annotation_ink_expected.pdf.0.png
+++ b/pdfium/annots/annotation_ink_expected.pdf.0.png
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diff --git a/pdfium/annots/annotation_ink_multiple.pdf b/pdfium/annots/annotation_ink_multiple.pdf
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diff --git a/pdfium/annots/annotation_ink_multiple_expected.pdf.0.png b/pdfium/annots/annotation_ink_multiple_expected.pdf.0.png
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+++ b/pdfium/annots/annotation_ink_multiple_expected.pdf.0.png
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