tree 57c19626fd9b718e49b170caa847c8a405f0f6a7
parent 2205680bf36ac55dd8364fa6d2eaca3566dc7e0d
author Jeff Sharkey <jsharkey@android.com> 1445301964 -0700
committer Jeff Sharkey <jsharkey@android.com> 1445301968 -0700

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