This CL interposes the draw call API entries. If enabled by command line
option "--minimize-gpu-work", it will override all draw calls to render
a single GL_POINT instead. It forces view port and scissor size to 1x1.
It forces all data copy to 1 texel or 1 byte. It ignores
glGenerateMipmap call. The goal is to make the frame time reflect the
driver CPU performance as much as possible so that we can use it to
compare ANGLE vs native GLES on the driver overhead, as well as
identifying CPU hot spot.

Bug: b/184766477
Change-Id: Ie8b5b585e0ed55320fed7863da37cce419acc65f
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2802858
Commit-Queue: Charlie Lao <cclao@google.com>
Reviewed-by: Cody Northrop <cnorthrop@google.com>
Reviewed-by: Jamie Madill <jmadill@chromium.org>