Update from https://crrev.com/314320

cc/resources/bitmap_tile_task_worker_pool.cc

Index: cc/resources/bitmap_tile_task_worker_pool.cc
diff --git a/cc/resources/bitmap_tile_task_worker_pool.cc b/cc/resources/bitmap_tile_task_worker_pool.cc
index 1dc93776e06e46e65606514299467da5747b64ce..77abd8dc04b2377a1f2ebd871c1660a1fd6f0e89 100644
--- a/cc/resources/bitmap_tile_task_worker_pool.cc
+++ b/cc/resources/bitmap_tile_task_worker_pool.cc
@@ -128,7 +128,8 @@ void BitmapTileTaskWorkerPool::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_);