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Introduce a new AnchoredPopupWindow class, containing most of the logic
previously in TextBubble, and refactor TextBubble to use this new class.
Also introduces a ViewRectProvider that contains most of the logic
previously in ViewAnchoredTextBubble.

This lays the ground work for using AnchoredPopupWindow (with extra
positioning customization/logic) for ListMenuButton to work around a bug
in Android ListPopupWindow positioning introduced in Android N.

BUG=709522

Change-Id: Ie6364ddcbd7b84736650ad3df8d433e1a75be6b6
Reviewed-on: https://chromium-review.googlesource.com/884328
Commit-Queue: Theresa <twellington@chromium.org>
Reviewed-by: Matthew Jones <mdjones@chromium.org>
Reviewed-by: David Trainor <dtrainor@chromium.org>
Cr-Commit-Position: refs/heads/master@{#532012}