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Native interface includes MessageWrapper and MessageDispatcherBridge.
MessageWrapper represents a message for native feature code and allows
feature code to set message properties before enqueueing it. Java side
of MessageWrapper constructs PropertyModel that maintains property
values.
MessageDispatcherBridge enables feature code to interact with Java
MessageDispatcher to enqueue/dismiss message.

BUG=1123947
R=lazzzis@chromium.org

Change-Id: I28b58ed080dd63045f2e18f13e3875fabd9764e1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2472599Reviewed-by: David Trainor <dtrainor@chromium.org>
Reviewed-by: Nasko Oskov <nasko@chromium.org>
Reviewed-by: Filip Gorski <fgorski@chromium.org>
Reviewed-by: Theresa  <twellington@chromium.org>
Reviewed-by: Matthew Jones <mdjones@chromium.org>
Commit-Queue: Pavel Yatsuk <pavely@chromium.org>
Cr-Commit-Position: refs/heads/master@{#825040}