1865861 - Allow using PERFTESTS_MANIFESTS to define mozperftest tests in mochitest

Status: NEW

(Testing :: mozperftest, defect, P2)

Description

[Greg Mierzwinski [:sparky]]

Currently, if you try to add a perftest to PERFTESTS_MANIFESTS for mochitest, you'll hit an error from mach test that prevents us from using this variable. Instead, we need to add them to the mochitest manifest variable like so (depending on the flavour - this is for mochitest-plain):

MOCHITEST_MANIFESTS += [
    "test/performance/perftest.toml",
]

This is the error we get when we try to use PERFTESTS_MANIFESTS:

$ ./mach perftest dom/serviceworkers/test/performance/test_fetch.html

Good job! Best selection.
dom/serviceworkers/test/performance/test_fetch.html
 0:00.64 Running profile:run
 0:00.64 Created profile at /tmp/tmpf5fjh8ko.mozrunner
 0:00.64 Running mochitest:run
Test configuration changed. Regenerating backend.
I know you are trying to run a perftest test. Unfortunately, I can't run those
tests yet. Sorry!