This commit adds support for querying the GL_BUFFER_DATA_SIZE of
GL_ATOMIC_COUNTER_BUFFER in the D3D renderer.

Bug: angleproject:1729
Test: angle_end2end_tests
Change-Id: Id6aae0d92c5e0960b2b245ba7d83970b04ba4eed
Reviewed-on: https://chromium-review.googlesource.com/c/1399143
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Geoff Lang <geofflang@chromium.org>