Add a host tool to pack R_ARM_RELATIVE relocations in libchrome.<ver>.so.

tools/relocation_packer/src/debug.cc

+// Copyright 2014 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 <stdarg.h>
+#include <stdio.h>
+
+#include "debug.h"
+
+namespace relocation_packer {
+
+Logger* Logger::instance_ = NULL;
+
+Logger* Logger::GetInstance() {
+  if (instance_ == NULL)
+    instance_ = new Logger;
+  return instance_;
+}
+
+void Logger::Log(const char* format, va_list args) {
+  vfprintf(stdout, format, args);
+}
+
+void Logger::Log(const char* format, ...) {
+  va_list args;
+  va_start(args, format);
+  GetInstance()->Log(format, args);
+  va_end(args);
+}
+
+void Logger::VLog(const char* format, ...) {
+  if (GetInstance()->is_verbose_) {
+    va_list args;
+    va_start(args, format);
+    GetInstance()->Log(format, args);
+    va_end(args);
+  }
+}
+
+void Logger::SetVerbose(bool flag) {
+  GetInstance()->is_verbose_ = flag;
+}
+
+}  // namespace relocation_packer