Add locking when mutating RecentTasks.

Otherwise there is a really rare race condition where we try tearing
down the tasks while we're still setting them up.

Bug: 25078914
Change-Id: Icf89241f9abec3fadc8606cfb4fbc029bbe91515
1 file changed
tree: 57c19626fd9b718e49b170caa847c8a405f0f6a7
  1. res/
  2. src/
  3. tests/
  4. Android.mk
  5. AndroidManifest.xml
  6. wrap_alpha.py