Add Skia shallow gradient test output to testing corpus.

BUG=pdfium:1152

Change-Id: I5ee5f0f3956d4999b26eaf840ac4d3dad56214a5
Reviewed-on: https://pdfium-review.googlesource.com/c/43451
Reviewed-by: Henrique Nakashima <hnakashima@chromium.org>
diff --git a/third_party/skia/20180916_098c1355/shallow_gradient_conical.pdf b/third_party/skia/20180916_098c1355/shallow_gradient_conical.pdf
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diff --git a/third_party/skia/20180916_098c1355/shallow_gradient_conical_nodither.pdf b/third_party/skia/20180916_098c1355/shallow_gradient_conical_nodither.pdf
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diff --git a/third_party/skia/20180916_098c1355/shallow_gradient_linear.pdf b/third_party/skia/20180916_098c1355/shallow_gradient_linear.pdf
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diff --git a/third_party/skia/20180916_098c1355/shallow_gradient_linear_nodither.pdf b/third_party/skia/20180916_098c1355/shallow_gradient_linear_nodither.pdf
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diff --git a/third_party/skia/20180916_098c1355/shallow_gradient_radial.pdf b/third_party/skia/20180916_098c1355/shallow_gradient_radial.pdf
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diff --git a/third_party/skia/20180916_098c1355/shallow_gradient_radial_nodither.pdf b/third_party/skia/20180916_098c1355/shallow_gradient_radial_nodither.pdf
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diff --git a/third_party/skia/20180916_098c1355/shallow_gradient_sweep.pdf b/third_party/skia/20180916_098c1355/shallow_gradient_sweep.pdf
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diff --git a/third_party/skia/20180916_098c1355/shallow_gradient_sweep_nodither.pdf b/third_party/skia/20180916_098c1355/shallow_gradient_sweep_nodither.pdf
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