Ensure deterministic heap prioritization of raster task nodes

cc/resources/zero_copy_tile_task_worker_pool.cc

Index: cc/resources/zero_copy_tile_task_worker_pool.cc
diff --git a/cc/resources/zero_copy_tile_task_worker_pool.cc b/cc/resources/zero_copy_tile_task_worker_pool.cc
index 5fd082d6afe21f452282c03a75e08a2140839639..943221457cb3965a19f21de8fa455c1fc99c6a6f 100644
--- a/cc/resources/zero_copy_tile_task_worker_pool.cc
+++ b/cc/resources/zero_copy_tile_task_worker_pool.cc
@@ -133,7 +133,8 @@ void ZeroCopyTileTaskWorkerPool::ScheduleTasks(TileTaskQueue* queue) {
 
   for (TaskSet task_set = 0; task_set < kNumberOfTaskSets; ++task_set) {
     InsertNodeForTask(&graph_, new_task_set_finished_tasks[task_set].get(),
-                      kTaskSetFinishedTaskPriority, task_count[task_set]);
+                      kTaskSetFinishedTaskPriorityBase + task_set,
+                      task_count[task_set]);
   }
 
   ScheduleTasksOnOriginThread(this, &graph_);