Bug 1385401 - Fetch Google Play listings outside of the push-apk task r=aki

MozReview-Commit-ID: 2PTvLx4Atj5

taskcluster/taskgraph/transforms/task.py

@@ -93,6 +93,8 @@ task_description_schema = Schema({
     # method.
     Optional('dependencies'): {basestring: object},
 
+    Optional('requires'): Any('all-completed', 'all-resolved'),
+
     # expiration and deadline times, relative to task creation, with units
     # (e.g., "14 days").  Defaults are set based on the project.
     Optional('expires-after'): basestring,
@@ -567,6 +569,9 @@ task_description_schema = Schema({
 
             # Paths to the artifacts to sign
             Required('paths'): [basestring],
+
+            # Artifact is optional to run the task
+            Optional('optional', default=False): bool,
         }],
 
         # "Invalid" is a noop for try and other non-supported branches
@@ -1422,6 +1427,9 @@ def build_task(config, tasks):
             'priority': task['priority'],
         }
 
+        if task.get('requires', None):
+            task_def['requires'] = task['requires']
+
         if task_th:
             # link back to treeherder in description
             th_push_link = 'https://treeherder.mozilla.org/#/jobs?repo={}&revision={}'.format(