base: Support setting thread priorities generically.

base/threading/platform_thread_win.cc

Index: base/threading/platform_thread_win.cc
diff --git a/base/threading/platform_thread_win.cc b/base/threading/platform_thread_win.cc
index 9e877b32f9e1e630ce31c164f5e58680b898e5f7..6a7dedc978e33c2af7460ed4b4b8b8dd893b176f 100644
--- a/base/threading/platform_thread_win.cc
+++ b/base/threading/platform_thread_win.cc
@@ -153,7 +153,7 @@ bool PlatformThread::CreateWithPriority(size_t stack_size, Delegate* delegate,
                                         ThreadPriority priority) {
   bool result = Create(stack_size, delegate, thread_handle);
   if (result)
-    SetThreadPriority(*thread_handle, priority);
+    SetThreadPriority(*thread_handle, 0, priority);
   return result;
 }
 
@@ -191,6 +191,7 @@ void PlatformThread::Join(PlatformThreadHandle thread_handle) {
 
 // static
 void PlatformThread::SetThreadPriority(PlatformThreadHandle handle,
+                                       PlatformThreadId,
                                        ThreadPriority priority) {
   switch (priority) {
     case kThreadPriority_Normal:
@@ -199,6 +200,9 @@ void PlatformThread::SetThreadPriority(PlatformThreadHandle handle,
     case kThreadPriority_RealtimeAudio:
       ::SetThreadPriority(handle, THREAD_PRIORITY_TIME_CRITICAL);
       break;
+    default:
+      NOTREACHED() << "Unknown priority.";
+      break;
   }
 }