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Makes the list more discoverable and easy to find.

Also take the chance to rename chromium.perf -> chrome.perf waterfall.

Bug: 958739
Change-Id: Icb64f5290abb2bb31575956889faba23adf6c944
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1886853
Commit-Queue: Juan Antonio Navarro Pérez <perezju@chromium.org>
Commit-Queue: Sami Kyöstilä <skyostil@chromium.org>
Auto-Submit: Juan Antonio Navarro Pérez <perezju@chromium.org>
Reviewed-by: Sami Kyöstilä <skyostil@chromium.org>
Cr-Commit-Position: refs/heads/master@{#710296}