libui: Convert Allocator and Mapper to gralloc1

Converts GraphicBufferAllocator and GraphicBufferMapper to speak
gralloc 1.0 (via the C++ shim and optionally the 1On0 adapter) instead
of gralloc 0.x.

Bug: 28401203
Change-Id: Ie1649f0ee72801579be2c2d3c47177b52962a825
5 files changed