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This was not being handled correctly before. We now require passing back
in the prior decoded slice data so that dependent slice header parsing
will be correct. Previously we relied on the decoder to do this, but
even then we didn't handle all the fields properly. Fixes new fuzzer
case and removes need for prior fuzzer fix in this area.

This also fixes a range check issue where values needed to be in the 0
to 2^15 - 1 range for a few things that fixes another fuzzer case.

BUG=b:153111783,chrome:1149206,chrome:1148863,chrome:1149205
TEST=H265 playback still works, unit/fuzzer tests pass

Change-Id: I722dd5d2996685fd716f2218b3d9031a51fc4c79
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2542946
Commit-Queue: Jeffrey Kardatzke <jkardatzke@google.com>
Reviewed-by: Sergey Volk <servolk@chromium.org>
Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#828369}