Fix transcode progress notification

The executor and listener fields are guarded by a lock, but the lock was
not taken out when notifying progress updates.

Test: Will be tested via MediaTranscodingManagerTest but it currently fails due to b/274472195
Fixes: 277383391
Change-Id: Ib8dce559d57564f6383c43bd1c9e2efedda7d92c
1 file changed
tree: 0f31659c70f15c3d91cb2a422d4863c5e11cc913
  1. apex/