Commits
Hangyu Kuang committed 3cffa0c74ee
Move vp9_thread.* to common. Prepare for frame parallel decoding, the reference count buffers need to be protected by mutex. Move vp9_thread.* to common folder so that those buffers could use cross-platform mutex from vp9_thread.*. (cherry picked from commit 337e8015c9deaf8ab7e8d0c3c132160a77dd1590) Change-Id: I0587a08447925f4554d7788686a31483c2ae3f37