base: Implement GetCurrentThreadPriority.

components/startup_metric_utils/browser/startup_metric_utils.cc

Index: components/startup_metric_utils/browser/startup_metric_utils.cc
diff --git a/components/startup_metric_utils/browser/startup_metric_utils.cc b/components/startup_metric_utils/browser/startup_metric_utils.cc
index 31890eb523871670a0d45e8038b1c07955011711..3ac80bdafd2e68105a4e4bbadf04ba6ade60cd98 100644
--- a/components/startup_metric_utils/browser/startup_metric_utils.cc
+++ b/components/startup_metric_utils/browser/startup_metric_utils.cc
@@ -271,7 +271,6 @@ base::TimeTicks StartupTimeToTimeTicks(const base::Time& time) {
 
 // platform_thread_mac.mm unfortunately doesn't properly support base's
 // thread priority APIs (crbug.com/554651).
-#if !defined(OS_MACOSX)
   static bool statics_initialized = false;
 
   base::ThreadPriority previous_priority = base::ThreadPriority::NORMAL;
@@ -280,18 +279,15 @@ base::TimeTicks StartupTimeToTimeTicks(const base::Time& time) {
     base::PlatformThread::SetCurrentThreadPriority(
         base::ThreadPriority::DISPLAY);
   }
-#endif
 
   static const base::Time time_base = base::Time::Now();
   static const base::TimeTicks trace_ticks_base = base::TimeTicks::Now();
 
-#if !defined(OS_MACOSX)
   if (!statics_initialized) {
     base::PlatformThread::SetCurrentThreadPriority(previous_priority);
   }
 
   statics_initialized = true;
-#endif
 
   // Then use the TimeDelta common ground between the two units to make the
   // conversion.