Bug 1634184 - Pick up visual metrics tasks in the cron task. r=tarek

The visual metrics tasks were not being picked up by the cron task. This patch fixes this by correctly parsing for vismet tasks in the general_perf_testing cron task.

Differential Revision: https://phabricator.services.mozilla.com/D73294

taskcluster/taskgraph/target_tasks.py

@@ -529,9 +529,15 @@ def target_tasks_general_perf_testing(full_task_graph, parameters, graph_config)
     def filter(task):
         platform = task.attributes.get('build_platform')
         attributes = task.attributes
-        if attributes.get('unittest_suite') != 'raptor':
+        vismet = attributes.get('kind') == 'visual-metrics-dep'
+        if attributes.get('unittest_suite') != 'raptor' and not vismet:
             return False
+
         try_name = attributes.get('raptor_try_name')
+        if vismet:
+            # Visual metric tasks are configured a bit differently
+            platform = task.task.get('extra').get('treeherder-platform')
+            try_name = task.label
 
         # Run chrome and chromium on all platforms available
         if '-chrome' in try_name: