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..045d613271e269b49a710e1c0b3dc51caaddeabc 100644
--- a/base/threading/platform_thread_win.cc
+++ b/base/threading/platform_thread_win.cc
@@ -103,6 +103,12 @@ PlatformThreadId PlatformThread::CurrentId() {
 }
 
 // static
+PlatformThreadHandle PlatformThread::CurrentHandle() {
+  NOTIMPLEMENTED(); // See OpenThread()
+  return kNullThreadHandle;
+}
+
+// static
 void PlatformThread::YieldCurrentThread() {
   ::Sleep(0);
 }
@@ -199,6 +205,9 @@ void PlatformThread::SetThreadPriority(PlatformThreadHandle handle,
     case kThreadPriority_RealtimeAudio:
       ::SetThreadPriority(handle, THREAD_PRIORITY_TIME_CRITICAL);
       break;
+    default:
+      NOTREACHED() << "Unknown priority.";
+      break;
   }
 }