tree ad3508dd7565bfc0ec83d04d6191394082ac42ca
parent 915b9b80b0de8001a6a3d3a951ca5e55ed72cb7b
author Sarah Parker <sarahparker@google.com> 1572046232 -0700
committer Sarah Parker <sarahparker@google.com> 1573537927 +0000

Properly update reference stack for fwd-kf

This puts the invisible coded keyframe in the altref stack
until display time. When the frame is displayed, it is pushed
back into the golden frame stack. The display index for the
show_existing_frame is also updated properly.

Change-Id: I9608387552fca8f24a0181ba3ba1b9e6c4977ad7