Fix run-test on host.

Change-Id: I44ebb4cdc2f5966be51a063e3c7256ab3016c404
diff --git a/src/logging.h b/src/logging.h
index 7c04777..c1ea3ab 100644
--- a/src/logging.h
+++ b/src/logging.h
@@ -262,6 +262,15 @@
   bool startup;
   bool third_party_jni; // Enabled with "-verbose:third-party-jni".
   bool threads;
+  std::ostream* logging_stream;
+
+  void SetLoggingStream(std::ostream* new_logging_stream) {
+    DCHECK(new_logging_stream->good());
+    if (logging_stream != NULL) {
+      delete logging_stream;
+    }
+    logging_stream = new_logging_stream;
+  }
 };
 
 extern LogVerbosity gLogVerbosity;