Add full SetThreadPriority support to Windows.

base/threading/platform_thread_freebsd.cc

Index: base/threading/platform_thread_freebsd.cc
diff --git a/base/threading/platform_thread_freebsd.cc b/base/threading/platform_thread_freebsd.cc
index a163f650443d08f1602ff295e8c985dab7c7ddd2..0d98e998c8e35671a3ecfe97f4bab0e98091d728 100644
--- a/base/threading/platform_thread_freebsd.cc
+++ b/base/threading/platform_thread_freebsd.cc
@@ -36,9 +36,11 @@ const ThreadPriorityToNiceValuePair kThreadPriorityToNiceValueMap[4] = {
   { kThreadPriority_Display, -6 },
 }
 
-bool HandleSetThreadPriorityForPlatform(PlatformThreadHandle handle,
-                                        ThreadPriority priority) {
+bool SetThreadPriorityForPlatform(PlatformThreadHandle handle,
+                                  ThreadPriority priority) {
 #if !defined(OS_NACL)
+  // TODO: Assess the correctness of using |pthread_self()| below instead of
+  // |handle|. http://crbug.com/468793.
   return priority == kThreadPriority_RealtimeAudio &&
          pthread_setschedparam(pthread_self(), SCHED_RR, &kRealTimePrio) == 0;
 #else
@@ -46,6 +48,24 @@ bool HandleSetThreadPriorityForPlatform(PlatformThreadHandle handle,
 #endif
 }
 
+bool GetThreadPriorityForPlatform(PlatformThreadHandle handle,
+                                  ThreadPriority* priority) {
+#if !defined(OS_NACL)
+  // TODO: Assess the correctness of using |pthread_self()| below instead of

[rvargas (doing something else), 2015/03/31 22:43:45]

nit: add a name (no, the name on a TODO is not meant to point to the person in
charge of implementing it).

[gab, 2015/04/01 01:14:39]

Done.

+  // |handle|. http://crbug.com/468793.
+  int maybe_sched_rr = 0;
+  struct sched_param maybe_realtime_prio = {0};
+  if (pthread_getschedparam(pthread_self(), &maybe_sched_rr,
+                            &maybe_realtime_prio) == 0 &&
+      maybe_sched_rr == SCHED_RR &&
+      maybe_realtime_prio.sched_priority == kRealTimePrio.sched_priority) {
+    *priority = kThreadPriority_RealtimeAudio;
+    return true;
+  }
+#endif
+  return false;
+}
+
 }  // namespace internal
 
 // static