Add TaskPriority as a parameter to SequencedWorkerPool in preparation for TaskScheduler experiment.

base/test/sequenced_worker_pool_owner.cc

Index: base/test/sequenced_worker_pool_owner.cc
diff --git a/base/test/sequenced_worker_pool_owner.cc b/base/test/sequenced_worker_pool_owner.cc
index 8781495d7d381ddde91088dfd314f9bde03cb7a6..c6c043c1b47b49355d91dadbc7c3c4f947868f6b 100644
--- a/base/test/sequenced_worker_pool_owner.cc
+++ b/base/test/sequenced_worker_pool_owner.cc
@@ -14,7 +14,10 @@ SequencedWorkerPoolOwner::SequencedWorkerPoolOwner(
     size_t max_threads,
     const std::string& thread_name_prefix)
     : constructor_message_loop_(MessageLoop::current()),
-      pool_(new SequencedWorkerPool(max_threads, thread_name_prefix, this)),
+      pool_(new SequencedWorkerPool(max_threads,
+                                    thread_name_prefix,
+                                    TaskPriority::USER_VISIBLE,
+                                    this)),
       has_work_call_count_(0) {}
 
 SequencedWorkerPoolOwner::~SequencedWorkerPoolOwner() {