Currently, we use chart JSON to indicate whether Telemetry tests are enabled or disabled. However, we intend to switch Telemetry's primary output format to HistogramSet, which does not have support for enabled/disabled indication. Fortunately, we have recently started outputting Chromium's JSON test results format, which does have support for indicating enabled/disabled status of tests.

We want to switch to using the JSON test results format for this indication instead of chart JSON, so that we can safely switch the transit for performance results from chart JSON to HistogramSet. To do this, we should make use of the 'expected' and 'actual' fields of the result: if a test was skipped and was expected to have been skipped, then this implies that it was disabled.