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Ensure that the Incognito Bubble presentation is deferred until after
the feature engagement tracker is initialized, just as the New Tab
Bubble is deferred.

Bug: 778395
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: I33c86953665211a7cfafc8e27349892d01e43b80
Reviewed-on: https://chromium-review.googlesource.com/809848Reviewed-by: edchin <edchin@chromium.org>
Commit-Queue: Gregory Chatzinoff <gchatz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#521949}