win: Add UUID::InitializeFromSystemUUID()

util/misc/uuid.cc

 // Copyright 2014 The Crashpad Authors. All rights reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
 //     http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
@@ skipping 70 matching lines @@
                   &temp.data_5[3],
                   &temp.data_5[4],
                   &temp.data_5[5]);
   if (rv != 11)
     return false;
 
   *this = temp;
   return true;
 }
 
+#if defined(OS_WIN)
+void UUID::InitializeFromSystemUUID(const ::UUID* system_uuid) {
+  static_assert(sizeof(::UUID) == sizeof(UUID),
+                "unexpected system uuid size");
+  static_assert(offsetof(::UUID, Data1) == offsetof(UUID, data_1),
+                "unexpected system uuid layout");
+  memcpy(this, system_uuid, sizeof(::UUID));
+}
+#endif  // OS_WIN
+
 std::string UUID::ToString() const {
   return base::StringPrintf("%08x-%04x-%04x-%02x%02x-%02x%02x%02x%02x%02x%02x",
                             data_1,
                             data_2,
                             data_3,
                             data_4[0],
                             data_4[1],
                             data_5[0],
                             data_5[1],
                             data_5[2],
                             data_5[3],
                             data_5[4],
                             data_5[5]);
 }
 
 #if defined(OS_WIN)
 base::string16 UUID::ToString16() const {
   return base::UTF8ToUTF16(ToString());
 }
 #endif  // OS_WIN
 
 }  // namespace crashpad