diff -r 000000000000 -r 6474c204b198 ipc/chromium/src/base/debug_util.cc
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ipc/chromium/src/base/debug_util.cc	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,77 @@
+// Copyright (c) 2006-2008 The Chromium 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 "base/debug_util.h"
+
+#include "base/platform_thread.h"
+
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#ifdef OS_WIN
+#include <io.h>
+#else
+#include <unistd.h>
+#endif
+
+#ifndef STDOUT_FILENO
+#define STDOUT_FILENO 1
+#endif
+
+bool DebugUtil::WaitForDebugger(int wait_seconds, bool silent) {
+  for (int i = 0; i < wait_seconds * 10; ++i) {
+    if (BeingDebugged()) {
+      if (!silent)
+        BreakDebugger();
+      return true;
+    }
+    PlatformThread::Sleep(100);
+  }
+  return false;
+}
+
+const void *const *StackTrace::Addresses(size_t* count) {
+  *count = trace_.size();
+  if (trace_.size())
+    return &trace_[0];
+  return NULL;
+}
+
+namespace mozilla {
+
+EnvironmentLog::EnvironmentLog(const char* varname)
+{
+  const char *e = getenv(varname);
+  if (e && *e)
+    fname_ = e;
+}
+
+EnvironmentLog::~EnvironmentLog()
+{
+}
+
+void
+EnvironmentLog::print(const char* format, ...)
+{
+  if (!fname_.size())
+    return;
+
+  FILE* f;
+  if (fname_.compare("-") == 0)
+    f = fdopen(dup(STDOUT_FILENO), "a");
+  else
+    f = fopen(fname_.c_str(), "a");
+
+  if (!f)
+    return;
+
+  va_list a;
+  va_start(a, format);
+  vfprintf(f, format, a);
+  va_end(a);
+  fclose(f);
+}
+
+} // namespace mozilla