Use separate PoolCounter config for expensive thumbnails

Depends on Ic62984e0f4a761642b2bdd1bfa362301ed94c284
and If40e223c328ddd15310d13f2a49000bf6e08200e

Bug: 65691
Change-Id: Ic737673b5a31974d866b9bf5afa4b4036baa03bb
Merge "Use separate PoolCounter config for expensive thumbnails"