Moving GUID generation from base to chrome/browser/guid*

chrome/browser/guid_posix.cc

+// Copyright (c) 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 "chrome/browser/guid.h"
+
+#include "base/rand_util.h"
+#include "base/stringprintf.h"
+
+namespace guid {
+
+std::string GenerateGUID() {
+  uint64 sixteen_bytes[2] = { base::RandUint64(), base::RandUint64() };
+  return RandomDataToGUIDString(sixteen_bytes);
+}
+
+// TODO(cmasone): Once we're comfortable this works, migrate Windows code to
+// use this as well.
+std::string RandomDataToGUIDString(const uint64 bytes[2]) {
+  return StringPrintf("%08X-%04X-%04X-%04X-%012llX",
+                      static_cast<unsigned int>(bytes[0] >> 32),
+                      static_cast<unsigned int>((bytes[0] >> 16) & 0x0000ffff),
+                      static_cast<unsigned int>(bytes[0] & 0x0000ffff),
+                      static_cast<unsigned int>(bytes[1] >> 48),
+                      bytes[1] & 0x0000ffffffffffffULL);
+}
+
+}  // namespace guid