Add 'dsset' structure.

scheduler/appengine/engine/internal/tq_tasks.proto

Index: scheduler/appengine/engine/internal/tq_tasks.proto
diff --git a/scheduler/appengine/engine/internal/tq_tasks.proto b/scheduler/appengine/engine/internal/tq_tasks.proto
index b90ca76863155f3c2b6732f6d5b01c379938c516..1f796ab98d7dc17de7b45ddb64ef909e3fd8c71f 100644
--- a/scheduler/appengine/engine/internal/tq_tasks.proto
+++ b/scheduler/appengine/engine/internal/tq_tasks.proto
@@ -24,6 +24,24 @@ message TickLaterTask {
 }
 
 
-message StartInvocationTask {
+message TriggerInvocationTask {
   string job_id = 1;
+  int64 trigger_id = 2;
+}
+
+
+message TriageTriggersTask {
+  string job_id = 1;
+}
+
+
+message LaunchInvocationsBatchTask {
+  string job_id = 1;
+  repeated int64 inv_id = 2;
+}
+
+
+message LaunchInvocationTask {
+  string job_id = 1;
+  int64 inv_id = 2;
 }