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This is a reland of 985a1f41. Also fix
an issue where SoftwareOutputDeviceWinProxy was crashing if we draw the
root RenderPass but never call SwapBuffers() as the |swap_ack_callback_|
wasn't set.

Original change's description:
> Don't disable draw during resize
>
> https://crrev.com/c/2011130 changed Display::DisableSwapUntilResize() to
> also block draw instead of just swap. This had the side of effect of
> blocking draw when the browser window is minimized, which means we stop
> casting tab/window contents. Switch DisableSwapUntilResize() back to
> just block swap instead of draw+swap.
>
> Bug: 1054239, b/149923568
> Change-Id: I66a10dc1e801c56783107ce4412ab557f70da9f8
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2068642
> Commit-Queue: kylechar <kylechar@chromium.org>
> Reviewed-by: Saman Sami <samans@chromium.org>
> Reviewed-by: Vasiliy Telezhnikov <vasilyt@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#744018}

Bug: 1054239, b/149923568
Change-Id: I4f96bcb9547f4c4b24c020ffff728e4fa08d0ce1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2078840Reviewed-by: Vasiliy Telezhnikov <vasilyt@chromium.org>
Commit-Queue: kylechar <kylechar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#745161}