ppapi_proxy: Make DebugPrintf more usable....

tests/fake_browser_ppapi/utility.cc

+// Copyright 2010 The Native Client Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can
+// be found in the LICENSE file.
+
+#include <stdarg.h>
+#include <stdlib.h>
+#include <stdio.h>
+
+namespace fake_browser_ppapi {
+
+void DebugPrintf(const char* format, ...) {
+  va_list argptr;
+  va_start(argptr, format);
+  fprintf(stdout, "fake_browser: ");
+  vfprintf(stdout, format, argptr);
+  va_end(argptr);
+  fflush(stdout);
+}
+
+}  // namespace fake_browser_ppapi