In WebP lossless chunks (identified by VP8L), width-minus-1 and height-minus-1 of the canvas are sequentially encoded as 14-bit integers. (spec: https://developers.google.com/speed/webp/docs/webp_lossless_bitstream_specification#3_riff_header)
WebPHandler, when decoding the canvas height, has been skipping two most-significant bits. This results in bogus values being read from larger losslessly-encoded files.
Change-Id: Ib5b26f36a15fa65e7990da2ebd94157faccc70c2
(cherry picked from commit 442b73cebbea6db7b7fc945189d5776602fabc8a)
849577a9b8