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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.

Bug: 829344
Cq-Include-Trybots: luci.chromium.try:ios-simulator-full-configs;master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: Ib2345a98f8ec284369b342d111cadf7f6a55adef
Reviewed-on: https://chromium-review.googlesource.com/1057708
Commit-Queue: Gauthier Ambard <gambard@chromium.org>
Reviewed-by: edchin <edchin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#559481}