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AssistantOverlays are views which are added to AssistantContainerView's
client view. Because they are added at this level of the view hierarchy,
they paint to a higher level in the layer tree than direct children of
AssistantContainerView.

AssistantOverlays are intended to behave as pseudo-children of views in
the Assistant view hierarchy that need to paint to a high level, say to
draw over top of Assistant cards.

This CL adds a flag guarded AssistantNotificationOverlay which behaves
as a pseudo-child of AssistantMainView and will be used to support
in-Assistant notifications in Assistant.

Future overlays will include a shadow that is painted above suggestion
chips when the Assistant main stage can be scrolled (b:112669597).

Bug: b:118654460
Change-Id: I8e9a2c9748b4ecb0fad51c2f27722890d20d4ff3
Reviewed-on: https://chromium-review.googlesource.com/c/1440906
Commit-Queue: David Black <dmblack@google.com>
Reviewed-by: Xiaohui Chen <xiaohuic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#628504}