Add overlay support for camera

Change-Id: I4089f2ba9d4a23af6ce53e9d1ece08260511502d
Revert "Simplify OpenGL TLS access on ARM."

This reverts commit 288870ebc3da8121b7a237a53280bd8b931b7a2f.

Change-Id: I1401ab19e3035c1ed132781f126aafc5149d66ae