Pass the GUID for the SharedMemoryHandle used by base::FieldTrialList.

base/metrics/field_trial_unittest.cc

 // Copyright (c) 2012 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/metrics/field_trial.h"
 
 #include <stddef.h>
 
 #include "base/base_switches.h"
 #include "base/build_time.h"
@@ skipping 1351 matching lines @@
   EXPECT_EQ(group_name, shm_group_name);
 
   // Check that the params match.
   std::map<std::string, std::string> shm_params;
   entry->GetParams(&shm_params);
   EXPECT_EQ(2u, shm_params.size());
   EXPECT_EQ("value1", shm_params["key1"]);
   EXPECT_EQ("value2", shm_params["key2"]);
 }
 
+#if !defined(OS_NACL)
+TEST(FieldTrialListTest, SerializeSharedMemoryHandleMetadata) {
+  std::unique_ptr<base::SharedMemory> shm(new SharedMemory());
+  shm->CreateAndMapAnonymous(4 << 10);
+
+  std::string serialized =
+      FieldTrialList::SerializeSharedMemoryHandleMetadata(shm->handle());
+#if defined(OS_WIN)
+  SharedMemoryHandle deserialized =
+      FieldTrialList::DeserializeSharedMemoryHandleMetadata(serialized);
+#else
+  SharedMemoryHandle deserialized =
+      FieldTrialList::DeserializeSharedMemoryHandleMetadata(-1, serialized);
+#endif
+  EXPECT_EQ(deserialized.GetGUID(), shm->handle().GetGUID());
+  EXPECT_FALSE(deserialized.GetGUID().is_empty());
+}
+#endif  // !defined(OS_NACL)
+
 }  // namespace base