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This CL adds an effect to make the "New Incognito Tab" row of the tools
menu blink a selected state when the in product help requires it.

TBR=edchin@chromium.org

Bug: 829344
Cq-Include-Trybots: luci.chromium.try:ios-simulator-full-configs;master.tryserver.chromium.mac:ios-simulator-cronet
Change-Id: Ic2e6fe63f5e2233f70ffaa0747c332778370132c
Reviewed-on: https://chromium-review.googlesource.com/1068044
Commit-Queue: Gauthier Ambard <gambard@chromium.org>
Reviewed-by: Gauthier Ambard <gambard@chromium.org>
Cr-Commit-Position: refs/heads/master@{#561006}