Reuse TTV, recreating deps to get faster load times, lower mem usage

Use a ViewPool for DesktopTaskView for same reason.

Fix: 369590189
Flag: com.android.launcher3.enable_refactor_task_thumbnail
Test: Manually looking at slow-mo videos of home to overview
Change-Id: I0335e4d0eea4841145815244bbbec19541f31c73
6 files changed