Add hardware buffer unit test from old skqp to skia.

This copies the hardware buffer unit test from, which was cherry picked
straight into skqp last year, into Skia proper.

There are not functional changes, but a few of the APIs have been updated
to work with newer Skia.

Bug: skia:
Change-Id: I2d7b2ed8b0b9314ca3e03e703a6a5ac53805275e
Reviewed-on: https://skia-review.googlesource.com/c/188034
Reviewed-by: Jim Van Verth <jvanverth@google.com>
Commit-Queue: Greg Daniel <egdaniel@google.com>
3 files changed