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2015-02-05XFA: Support PNG format in pdfium_test and add image diffingTom Sepez
Lays the groundwork for pixel-diffing tests in pdfium. This is a port of chromium's tools/image_diff/image_diff_png.cc onto the top of the fxcodec-provided version of libpng. pdfium_test is modified to support the new format, and the tools/image_diff.cc image comparison utility is provided, stripped of its base/ dependencies. Unfortunately, this can't be back-ported to origin/main, since the underlying PNG support isn't present inside pdfium. BUG=https://code.google.com/p/pdfium/issues/detail?id=62 R=thestig@chromium.org Review URL: https://codereview.chromium.org/870203005