Support lossless WebP #38
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Fix #37
Change
WebpDecoderto check if input is lossless format and get the size.Also, add a test for lossless format.
For info about WebP lossless format, see https://developers.google.com/speed/webp/docs/riff_container#simple_file_format_lossless and https://developers.google.com/speed/webp/docs/webp_lossless_bitstream_specification#3_riff_header.