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This CL moves SnackbarView.java, Snackbar.java, SnackbarCollection.java,
SnackbarManager.java. Tests will be moved in a separate CL.

BUG=1028382
R=mdjones@chromium.org

Change-Id: I847ce100b03fb3b4596ed02c2c32d2f8505ba4c5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1974902
Commit-Queue: Pavel Yatsuk <pavely@chromium.org>
Reviewed-by: Matthew Jones <mdjones@chromium.org>
Reviewed-by: Theresa  <twellington@chromium.org>
Cr-Commit-Position: refs/heads/master@{#727637}