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In the physics simulation, "phantom" nodes have been added approximately
where node label text will be rendered. Longer labels consist of more
phantom nodes. These phantom nodes do not appear in the final
visualization, but emit a weak repulsive force in order to help prevent
node labels from overlapping with each other.

Bug: 1109275
Change-Id: I59a941a89298d2937c368263c81feb16fffd692a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2357631
Commit-Queue: James Long <yjlong@google.com>
Reviewed-by: Mohamed Heikal <mheikal@chromium.org>
Reviewed-by: Samuel Huang <huangs@chromium.org>
Cr-Commit-Position: refs/heads/master@{#798684}