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Adds a named guide to the content area so it can be positionally matched by transitions.

Cq-Include-Trybots: luci.chromium.try:ios-simulator-full-configs;master.tryserver.chromium.mac:ios-simulator-cronet
Change-Id: Ifcb0d873d88cf0af2b9f898a8d9e151b601504da
Reviewed-on: https://chromium-review.googlesource.com/1118169
Commit-Queue: Mark Cogan <marq@chromium.org>
Reviewed-by: Gauthier Ambard <gambard@chromium.org>
Cr-Commit-Position: refs/heads/master@{#571527}