Unifying tile decoding for both direct and inverse tile order.
Now tile decoding consists of two stages: 1. Find tile buffer start and its size, put this info into tile_buffers. 2. Decode each tile based on information from tile_buffers. It seems that stage 1 can also be reused by multithreaded tile decoder. Change-Id: If0cdaefdd6d10bb41c63561346c9ae4cfac081dd
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