Add ScopedTrackers to measure the jank of base::Thread::StartWithOptions().

base/threading/thread.cc

Index: base/threading/thread.cc
diff --git a/base/threading/thread.cc b/base/threading/thread.cc
index ad1360be3e472fa926f4b057c2e51906c58fd88e..ea5b1747e3836a8092517b19e8197d1cf3debb62 100644
--- a/base/threading/thread.cc
+++ b/base/threading/thread.cc
@@ -6,11 +6,12 @@
 
 #include "base/bind.h"
 #include "base/lazy_instance.h"
+#include "base/profiler/scoped_tracker.h"
+#include "base/synchronization/waitable_event.h"
 #include "base/third_party/dynamic_annotations/dynamic_annotations.h"
 #include "base/threading/thread_id_name_manager.h"
 #include "base/threading/thread_local.h"
 #include "base/threading/thread_restrictions.h"
-#include "base/synchronization/waitable_event.h"
 
 #if defined(OS_WIN)
 #include "base/win/scoped_com_initializer.h"
@@ -94,6 +95,11 @@ bool Thread::Start() {
 }
 
 bool Thread::StartWithOptions(const Options& options) {
+  // TODO(eroman): Remove once crbug.com/465458 is solved.
+  tracked_objects::ScopedTracker tracking_profile(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION(
+        "465458 base::Thread::StartWithOptions"));
+
   DCHECK(!message_loop_);
 #if defined(OS_WIN)
   DCHECK((com_status_ != STA) ||
@@ -111,6 +117,11 @@ bool Thread::StartWithOptions(const Options& options) {
     return false;
   }
 
+  // TODO(eroman): Remove once crbug.com/465458 is solved.
+  tracked_objects::ScopedTracker tracking_profile_wait(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION(
+          "465458 base::Thread::StartWithOptions (Wait)"));
+
   // Wait for the thread to start and initialize message_loop_
   base::ThreadRestrictions::ScopedAllowWait allow_wait;
   startup_data.event.Wait();