GitLab

Added the missing return true and unit tests for both BufferFormat and
BufferUsage enum traits.

Bug: 732825
Change-Id: Idd41676f01a11f7666bf2c1c07621b4b9eae6b4a
Reviewed-on: https://chromium-review.googlesource.com/578211Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Commit-Queue: Xingyu Zhang <staraz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#488316}