Fixes: 27941148
Make OffscreenBuffer lifecycle an explicit (and tested) contract between
FrameBuilder and BakedOpRenderer, entirely separate from dispatch. This
makes it safe to reject any rendering work via overdraw content
rejection (before it gets to a BakedOpDispatcher).
Adds a couple tests around OffscreenBuffer leaks, and switches
OffscreenBuffer tests to RENDERTHREAD_TEST macro, as appropriate.
Change-Id: Id114b835d042708ae921028fb4b17e5fa485fe64
Now test-only common files reside in tests/common, and each test
executable type (macrobench, microbench, and unit) has a subdir there.
This change means the shared lib no longer has test code in it, and
sets up a means for scenes to be shared between tests.
Change-Id: I37b081f6977300e03fdd961b8e6439fde730605e
