To facilitate this change, I replaced the graph style with one style
config for lines/interpolation and one style config for points.
The output functions were updated to make use of the new styles.
Bug: None
Change-Id: I42404a8ce274d6e433bcdd6aee4b15b640e78b40
Reviewed-on: https://webrtc-review.googlesource.com/22000
Reviewed-by: Niels Moller <nisse@webrtc.org>
Commit-Queue: Björn Terelius <terelius@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#20645}