tree 3a6490ddaaa29f273af0d920f5aa2caa205c7435
parent f3a21c8ca2d100e779958ba6fd600c28e399d956
author Winson Chung <winsonc@google.com> 1431993200 -0700
committer Winson Chung <winsonc@google.com> 1432144614 -0700

Reducing delay in applying widget previews loaded in the background.

- Push the writing of previews to the DB to the worker thread
  to ensure that we can apply the loaded preview as soon as
  possible.
- Reducing additional bitmap allocations from cancelled tasks
  that did not re-add their bitmaps to the unused set
  (happens when the list is scrolling quickly).

Change-Id: Ib7c2cfdfcc668c215b3a74271e1165235fbdf752