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This is a first draft to get something out there.
I'm thinking I will rotation the chart to swap x and y later.

Bug: 1030840
Change-Id: I0b5c8204cb5be8f3d3708efc5588c382a8ce0d5b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1974836Reviewed-by: John Chen <johnchen@chromium.org>
Commit-Queue: John Chen <johnchen@chromium.org>
Commit-Queue: Caleb Rouleau <crouleau@chromium.org>
Cr-Commit-Position: refs/heads/master@{#726180}