Merge to M46: Enforce input and output dimensionalities for CPDF_StitchFunc.

testing/resources/bug_551460.pdf

Index: testing/resources/bug_551460.pdf
diff --git a/testing/resources/bug_551460.pdf b/testing/resources/bug_551460.pdf
new file mode 100644
index 0000000000000000000000000000000000000000..926e3fad2dc06e198f35a342f45dd1ca50bf5cb4
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