commit c807949408254556dfddfb365a3ad67db650df7d
author Jingning Han <jingning@google.com> Mon Oct 21 17:01:57 2013 -0700
committer Jingning Han <jingning@google.com> Tue Oct 22 09:02:41 2013 -0700
tree c5385fa2d34ffb6c1287d19f084dc049b3aa6996
parent 1e05c9a7e64ac29ddcd036c1f0e22c70cecb25b4

Prevent left_block_mode stepping into left tile

This commit uses left_available flag to decide if the left mode_info
struct is available for left_block_mode. As discussed with James
Zern (jzern@), this prevents the codec from fetching mode_info from
blocks in the left tile, which although effectively not used might
present concerns for multi-threaded tile decoding.

This is NOT a bit-stream change.

Change-Id: I1dc8cf1bcbf056688eee27c7bc5706ac4b4e0125