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This CL adds the ability to specify constraints for a NamedGuide using
frames and autoresizing masks.  This will be used to support laying out
the NamedGuide corresponding with the voice search button when voice
search is being triggered by the keyboard accessory view, as this view
is in a separate window from the rest of the application's hierarchy.

Bug: 805123
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: Icf6207f38629de2f5eac381b4f489f7213ecacd1
Reviewed-on: https://chromium-review.googlesource.com/952779Reviewed-by: Mark Cogan <marq@chromium.org>
Commit-Queue: Kurt Horimoto <kkhorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#545192}