Can rename/clean up the library to move from chrome style to angle
style. Can also start pulling out chrome-specific definitions. More work
to be done when moving gpu_info to use Angle's SystemInfo.

Bug: angleproject:2677
Change-Id: I75fd4446aa4be85fba590cd00cd3a213a0b3752e
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1538677
Commit-Queue: Jonah Ryan-Davis <jonahr@google.com>
Reviewed-by: Geoff Lang <geofflang@chromium.org>