The V1 chromeperf dashboard UI allows users to navigate the tree of timeseries by "subtests".
The V2 UI allows users to navigate timeseries semantically by their characteristics such as "measurement" and "test case".
Descriptor initially only supports test suites whose test paths conform exactly to the format `master/bot/suite/measurement/test_case`.

ParseTestPath and CompileTestPaths need to support non-conforming test paths. See the v2spa branch for examples:
https://chromium.googlesource.com/catapult/+/v2spa/dashboard/dashboard/api/describe.py