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This CL applies the swimlane constraints to the page bounds in X, to
squish all nodes into the page bounds instead of overflowing out through
both edges.

Bug: 1086231
Change-Id: I78755ec8edc054d9f18f91766a5460313715b3be
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2230323
Commit-Queue: Sigurður Ásgeirsson <siggi@chromium.org>
Reviewed-by: Joe Mason <joenotcharles@chromium.org>
Cr-Commit-Position: refs/heads/master@{#775145}