Bug 1342963 - only run jsreftests when js/src/* changes. r=dustin

MozReview-Commit-ID: 2stKqaayBHY

taskcluster/ci/test/tests.yml

@@ -318,6 +318,10 @@ jsreftest:
                             - remove_executables.py
                 extra-options:
                     - --reftest-suite=jsreftest
+    when:
+        files-changed:
+            - js/src/**
+            - js/public/**
 
 marionette:
     description: "Marionette unittest run"

taskcluster/taskgraph/transforms/tests.py

@@ -271,6 +271,11 @@ test_description_schema = Schema({
 
     # the product name, defaults to firefox
     Optional('product'): basestring,
+
+    # conditional files to determine when these tests should be run
+    Optional('when'): Any({
+        Optional('files-changed'): [basestring],
+    }),
 
 }, required=True)
 
@@ -633,6 +638,7 @@ def make_job_description(config, tests):
         jobdesc['name'] = name
         jobdesc['label'] = label
         jobdesc['description'] = test['description']
+        jobdesc['when'] = test.get('when', {})
         jobdesc['attributes'] = attributes
         jobdesc['dependencies'] = {'build': build_label}
         jobdesc['expires-after'] = test['expires-after']