This benchmark renders a single triangle to a double-buffered swapchain.
It uses a passthrough vertex and fragment shader written in GLSL and
compiled into SPIR-V using glslang.

Bug: b/158231104
Change-Id: I21f00f8f8595e018ff0d05f5af898a1f64d4dd12
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/45629
Presubmit-Ready: Nicolas Capens <nicolascapens@google.com>
Tested-by: Nicolas Capens <nicolascapens@google.com>
Reviewed-by: Antonio Maiorano <amaiorano@google.com>
Reviewed-by: Alexis Hétu <sugoi@google.com>