Is your feature request related to a problem? Please describe.
Now that we switched to gfx on master, it's quite annoying to enable the X11 on "gfx-backend-gl" in the clients of wgpu. It requires tracking the exact revision that wgpu uses, and copy-pasting it in the clients upon update. This also affects our player.

Describe the solution you'd like
Just always enable x11 feature

If the hello_triangle example is changed slightly to only draw the triangle once, and we change the color attachment's load_op to wgpu::LoadOp::Load instead of Clear, my expectation is that the result is the same, except that the green clear color is gone. However the result is that the red triangle only shows up every other frame, with blank frames in between.

Is this expected behavi