Join embeder threads on Windows.

runtime/bin/dbg_connection.cc

Index: runtime/bin/dbg_connection.cc
diff --git a/runtime/bin/dbg_connection.cc b/runtime/bin/dbg_connection.cc
index 2cc4cd83ffa761e4bc780f45c94c038b0980486a..6bd0cda256d67e5e109ffefcf55b1910c1461fc4 100644
--- a/runtime/bin/dbg_connection.cc
+++ b/runtime/bin/dbg_connection.cc
@@ -198,6 +198,9 @@ void DebuggerConnectionHandler::HandleMessages() {
       msgbuf_->ReadData();
     }
     if (!msgbuf_->Alive()) {
+      if (trace_debug_protocol) {
+        Log::Print("Debugger is exiting HandleMessages loop.\n");
+      }
       return;
     }
 
@@ -344,6 +347,13 @@ int DebuggerConnectionHandler::StartHandler(const char* address,
 }
 
 
+void DebuggerConnectionHandler::StopHandler() {
+  if (IsConnected()) {
+    DebuggerConnectionImpl::StopHandler(singleton_handler->debug_fd());
+  }
+}
+
+
 void DebuggerConnectionHandler::WaitForConnection() {
   ASSERT(handler_lock_ != NULL);
   MonitorLocker ml(handler_lock_);