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This new commands shows a Snackbar by creating the MDCSnackBarCommand in
the Coordinator, thus saving the caller to import Material components.

Bug: 1085419
Change-Id: Iee3d6c93f40b50558503d997d13c540d9e84c86d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2333069
Commit-Queue: Sergio Collazos <sczs@chromium.org>
Reviewed-by: edchin <edchin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#795003}