Add Skia xfermode test output to testing corpus.

BUG=pdfium:1152

Change-Id: Ia693a809a2d321c96cf93635547dfdac1f5e9342
Reviewed-on: https://pdfium-review.googlesource.com/42610
Reviewed-by: Henrique Nakashima <hnakashima@chromium.org>
diff --git a/third_party/skia/20180916_098c1355/xfermodeimagefilter.pdf b/third_party/skia/20180916_098c1355/xfermodeimagefilter.pdf
new file mode 100644
index 0000000..bcfff01
--- /dev/null
+++ b/third_party/skia/20180916_098c1355/xfermodeimagefilter.pdf
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diff --git a/third_party/skia/20180916_098c1355/xfermodeimagefilter_expected.pdf.0.png b/third_party/skia/20180916_098c1355/xfermodeimagefilter_expected.pdf.0.png
new file mode 100644
index 0000000..f9ea5bf
--- /dev/null
+++ b/third_party/skia/20180916_098c1355/xfermodeimagefilter_expected.pdf.0.png
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diff --git a/third_party/skia/20180916_098c1355/xfermodes.pdf b/third_party/skia/20180916_098c1355/xfermodes.pdf
new file mode 100644
index 0000000..0174d15
--- /dev/null
+++ b/third_party/skia/20180916_098c1355/xfermodes.pdf
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diff --git a/third_party/skia/20180916_098c1355/xfermodes2.pdf b/third_party/skia/20180916_098c1355/xfermodes2.pdf
new file mode 100644
index 0000000..4474e5d
--- /dev/null
+++ b/third_party/skia/20180916_098c1355/xfermodes2.pdf
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diff --git a/third_party/skia/20180916_098c1355/xfermodes2_expected.pdf.0.png b/third_party/skia/20180916_098c1355/xfermodes2_expected.pdf.0.png
new file mode 100644
index 0000000..594bb5d
--- /dev/null
+++ b/third_party/skia/20180916_098c1355/xfermodes2_expected.pdf.0.png
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diff --git a/third_party/skia/20180916_098c1355/xfermodes3.pdf b/third_party/skia/20180916_098c1355/xfermodes3.pdf
new file mode 100644
index 0000000..4db21ce
--- /dev/null
+++ b/third_party/skia/20180916_098c1355/xfermodes3.pdf
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diff --git a/third_party/skia/20180916_098c1355/xfermodes3_expected.pdf.0.png b/third_party/skia/20180916_098c1355/xfermodes3_expected.pdf.0.png
new file mode 100644
index 0000000..ee48a4a
--- /dev/null
+++ b/third_party/skia/20180916_098c1355/xfermodes3_expected.pdf.0.png
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diff --git a/third_party/skia/20180916_098c1355/xfermodes_expected.pdf.0.png b/third_party/skia/20180916_098c1355/xfermodes_expected.pdf.0.png
new file mode 100644
index 0000000..a9606db
--- /dev/null
+++ b/third_party/skia/20180916_098c1355/xfermodes_expected.pdf.0.png
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