Launch the next version of the Chromeperf Dashboard [V2SPA]

[benshayden]

The prototype of the next version of the chromeperf dashboard is currently a single giant CL. #4460 tracks adding dependencies to third_party. This bug tracks various tasks required to launch V2SPA as discussed with @simonhatch @anniesullie .

1. ~TBR dashboard/spa/* into a branch without tests.~ v2spa branch
2. ~Extend app.yaml and bin/deploy to support vulcanizing and deploying v2spa-dot-chromeperf.appspot.com~ v2spa.yaml
3. ~Add a minify script~
4. Test and land api request handler changes on master
   • ~descriptor.py~
   • ~test_suites.py~
   • ~describe.py~
   • ~timeseries2.py~
   • ~Upgrade PageStates~
   • ~ReportQuery~
   • ~ReportTemplate~
   • ~/api/report~
   • various bug fixes
5. Test and land modules from the branch to master in small CLs. In dependency order:
   • ~redux helpers~
   • ~utility functions~
   • ~icons~
   • ~CSS vars~
   • ~Material button~
   • ~Material checkbox~
   • ~Material textarea~
   • ~Material switch~
   • ~Material loading animation~
   • ~ElementBase~
   • ~Material input~
   • ~measureElement, measureText, sha, authorizationHeaders~
   • ~run_wct_tests~
   • ~ScalarSpan~
   • ~ChartLegend~
   • ~ExpandButton~
   • ~ColumnHead~
   • ~Request classes~
   • ~OptionGroup~
   • ~MenuInput~
   • TimeseriesCacheRequest
   • ~tag-filter~
   • ~memory-components~
   • ~place-holder~
   • ~chromeperf-app~
   • ~triage-new~
   • ~triage-existing~
   • ~recommended-options~
   • TeamFilter
   • chart-base
   • ~timeseries-descriptor~
   • ~alerts-table~
   • chart-timeseries
   • chart-complex
   • alerts-controls
   • alerts-section
   • add alerts-section to chromeperf-app
   • chart-section
   • add chart-section to chromeperf-app
   • report-table
   • report-template
   • report-section
   • add report-section to chromeperf-app
   • pivot-table
6. Write documentation.
7. Link between V1 and V2.
8. Continue soliciting feedback and adding and polishing features.
9. Finalize the design with stakeholders.
10. Update app.yaml and bin/deploy to serve V2SPA at chromeperf.appspot.com/ . May continue to serve V1 /group_report and /alerts if necessary.

Post-launch tasks such as deleting V1 and migrating to Polymer 3.0 will be tracked in separate bugs.

[benshayden]

Moved to https://bugs.chromium.org/p/chromium/issues/detail?id=918193