We're only uploading the timeline summary. To get the summary we need the timeline - we should persist the whole timeline and make sure that gets uploaded to luci for various runs so we can look at regressions more easily.

See e.g. https://ci.chromium.org/ui/p/flutter/builders/prod/Linux_android%20opacity_peephole_opacity_of_grid_perf__e2e_summary/2528/overview - under log links there, there is only a timeline summary, no timeline. This means that someone looking for more details about improvements or regressions needs to run the benchmark locally.