Don't recache in ContactPhotoManager unnecessarily

The ContactPhotoManager currently constantly tries to recache
bitmaps that were unable to load, or were too big to fit in the
cache. This can cause unnecessary CPU/network usage. Use a dummy
object instead to indicate that the bitmap should not be reloaded
for the given URI.

Bug: 21423350
Change-Id: I32c02efce3592b81c581adcfda39e1e668cefa60
1 file changed
tree: 56f176c9cc8c6e8ab14a6a0a4a6f36679111b63f
  1. src/
  2. TestCommon/
  3. tests/