VM: Fix deadlock in time line recording.

runtime/vm/os_thread_win.cc

Index: runtime/vm/os_thread_win.cc
diff --git a/runtime/vm/os_thread_win.cc b/runtime/vm/os_thread_win.cc
index 52fbd983fe6bdd8c7a1463f1929f14d77d8927e2..e871389f9157499cc1892e78e42f7dda7490b4ce 100644
--- a/runtime/vm/os_thread_win.cc
+++ b/runtime/vm/os_thread_win.cc
@@ -211,7 +211,9 @@ void OSThread::SetThreadLocal(ThreadLocalKey key, uword value) {
 }
 
 
-Mutex::Mutex() {
+Mutex::Mutex(bool recursive) {
+  // TODO(fschneider): Create recursive mutex if requested.
+
   // Allocate unnamed semaphore with initial count 1 and max count 1.
   data_.semaphore_ = CreateSemaphore(NULL, 1, 1, NULL);
   if (data_.semaphore_ == NULL) {