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The old-school layout logic in BVC was also re-inserting views on each
update, which is unnecessary, and in some cases causes views to show up
in the wrong z-order.  Insert only needs to happen on initial layout,
so gating this in a flag should fix the issues.

Bug: 782373
Change-Id: I326f3b9199717c0ad014267fa0239581574a826d
Reviewed-on: https://chromium-review.googlesource.com/763711Reviewed-by: Stepan Khapugin <stkhapugin@chromium.org>
Reviewed-by: Mark Cogan <marq@chromium.org>
Commit-Queue: Justin Cohen <justincohen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#515987}