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This patch adds the support of forcing enabling and disabling Dawn
Toggles through command line parameters "--enable-dawn-features"
and "--disable-dawn-features". Each toggles are separated by ",".

e.g.
--enable-dawn-features=use_d3d12_render_pass,disable_robustness
--disable-dawn-features=lazy_clear_resource_on_first_use

This patch also removes the support of the command line parameter
"--disable-dawn-robustness" as now its functionality can be replaced by
"--enable-dawn-features=disable_robustness".

BUG=dawn:480

Change-Id: If8c4fcc7d29f83c5c583b285439e4df73e714764
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2529009Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Austin Eng <enga@chromium.org>
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Commit-Queue: Jiawei Shao <jiawei.shao@intel.com>
Cr-Commit-Position: refs/heads/master@{#827520}