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

chrome/service/service_process.cc

Index: chrome/service/service_process.cc
diff --git a/chrome/service/service_process.cc b/chrome/service/service_process.cc
index dba9f442b06bc43052420897a680e4a52418729a..6afbaac0d6de36de4eed68e0bd8a0205869ef1a3 100644
--- a/chrome/service/service_process.cc
+++ b/chrome/service/service_process.cc
@@ -152,7 +152,8 @@ bool ServiceProcess::Initialize(base::MessageLoopForUI* message_loop,
     Teardown();
     return false;
   }
-  blocking_pool_ = new base::SequencedWorkerPool(3, "ServiceBlocking");
+  blocking_pool_ = new base::SequencedWorkerPool(
+      3, "ServiceBlocking", base::TaskPriority::USER_VISIBLE);
 
   request_context_getter_ = new ServiceURLRequestContextGetter();