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A few UI controls have been added with the aim of making edge directions
easier to see in the visualization.
* Curve checkbox: Determines if edges should be curved to the right of
their direction.
* Color on hover checkbox: Determines if the edge colors should only be
shown when hovering on a node that touches those edges.
* Color scheme dropdown: Various preset color schemes determined to work
well.

Bug: 1106107
Change-Id: I15585251ad1ef3eef4b16e1ce536a1b1f527868c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2314818
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@{#791430}