Lazily initialize MessageLoop for faster thread startup

base/threading/thread_id_name_manager_unittest.cc

Index: base/threading/thread_id_name_manager_unittest.cc
diff --git a/base/threading/thread_id_name_manager_unittest.cc b/base/threading/thread_id_name_manager_unittest.cc
index b5953d5d4d028505f67df11e68ba02ec48f5f1f0..72ad18b20934034d33bea647520b7278628f8cc3 100644
--- a/base/threading/thread_id_name_manager_unittest.cc
+++ b/base/threading/thread_id_name_manager_unittest.cc
@@ -4,6 +4,7 @@
 
 #include "base/threading/thread_id_name_manager.h"
 
+#include "base/synchronization/waitable_event.h"
 #include "base/threading/platform_thread.h"
 #include "base/threading/thread.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ -21,8 +22,8 @@ TEST_F(ThreadIdNameManagerTest, AddThreads) {
   base::Thread thread_a(kAThread);
   base::Thread thread_b(kBThread);
 
-  thread_a.Start();
-  thread_b.Start();
+  thread_a.StartAndWait();
+  thread_b.StartAndWait();
 
   EXPECT_STREQ(kAThread, manager->GetName(thread_a.thread_id()));
   EXPECT_STREQ(kBThread, manager->GetName(thread_b.thread_id()));
@@ -35,10 +36,10 @@ TEST_F(ThreadIdNameManagerTest, RemoveThreads) {
   base::ThreadIdNameManager* manager = base::ThreadIdNameManager::GetInstance();
   base::Thread thread_a(kAThread);
 
-  thread_a.Start();
+  thread_a.StartAndWait();
   {
     base::Thread thread_b(kBThread);
-    thread_b.Start();
+    thread_b.StartAndWait();
     thread_b.Stop();
   }
   EXPECT_STREQ(kAThread, manager->GetName(thread_a.thread_id()));
@@ -51,12 +52,12 @@ TEST_F(ThreadIdNameManagerTest, RestartThread) {
   base::ThreadIdNameManager* manager = base::ThreadIdNameManager::GetInstance();
   base::Thread thread_a(kAThread);
 
-  thread_a.Start();
+  thread_a.StartAndWait();
   base::PlatformThreadId a_id = thread_a.thread_id();
   EXPECT_STREQ(kAThread, manager->GetName(a_id));
   thread_a.Stop();
 
-  thread_a.Start();
+  thread_a.StartAndWait();
   EXPECT_STREQ("", manager->GetName(a_id));
   EXPECT_STREQ(kAThread, manager->GetName(thread_a.thread_id()));
   thread_a.Stop();