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

base/trace_event/memory_dump_manager_unittest.cc

Index: base/trace_event/memory_dump_manager_unittest.cc
diff --git a/base/trace_event/memory_dump_manager_unittest.cc b/base/trace_event/memory_dump_manager_unittest.cc
index d14093cbcc352361e7cbfcc6c29fd43eea3a461a..fc81ec5767e3c07f3e66626fb8163730b1f1252b 100644
--- a/base/trace_event/memory_dump_manager_unittest.cc
+++ b/base/trace_event/memory_dump_manager_unittest.cc
@@ -147,8 +147,9 @@ class MockMemoryDumpProvider : public MemoryDumpProvider {
 class TestSequencedTaskRunner : public SequencedTaskRunner {
  public:
   TestSequencedTaskRunner()
-      : worker_pool_(
-            new SequencedWorkerPool(2 /* max_threads */, "Test Task Runner")),
+      : worker_pool_(new SequencedWorkerPool(2 /* max_threads */,
+                                             "Test Task Runner",
+                                             base::TaskPriority::USER_VISIBLE)),
         enabled_(true),
         num_of_post_tasks_(0) {}