BufferQueue: Test remote producer and consumer

Adds a test that puts the BufferQueue into its own process and
connects to it over remote binder interfaces. This exposed the fact
that while IGBC was technically binderized, it didn't actually work
when flattened, so this change also fixes that.

Change-Id: I728cdb662a4273ddd3440ed6040a12560313fe68
2 files changed