Add a GUID to base::SharedMemoryHandle.

base/metrics/field_trial.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 <algorithm>
 #include <utility>
 
 #include "base/base_switches.h"
 #include "base/build_time.h"
 #include "base/command_line.h"
 #include "base/debug/activity_tracker.h"
 #include "base/logging.h"
 #include "base/metrics/field_trial_param_associator.h"
 #include "base/process/memory.h"
 #include "base/rand_util.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_util.h"
 #include "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
+#include "base/unguessable_token.h"
 
 // On POSIX, the fd is shared using the mapping in GlobalDescriptors.
 #if defined(OS_POSIX) && !defined(OS_NACL)
 #include "base/posix/global_descriptors.h"
 #endif
 
 namespace base {
 
 namespace {
 
@@ skipping 1098 matching lines @@
   }
   return entries;
 }
 
 #if defined(OS_WIN)
 // static
 bool FieldTrialList::CreateTrialsFromHandleSwitch(
     const std::string& handle_switch) {
   int field_trial_handle = std::stoi(handle_switch);
   HANDLE handle = reinterpret_cast<HANDLE>(field_trial_handle);
-  SharedMemoryHandle shm_handle(handle);
+  // TODO(erikchen): Plumb a GUID for this SharedMemoryHandle.
+  // https://crbug.com/713763.
+  SharedMemoryHandle shm_handle(handle, base::UnguessableToken::Create());
   return FieldTrialList::CreateTrialsFromSharedMemoryHandle(shm_handle);
 }
 #endif
 
 #if defined(OS_POSIX) && !defined(OS_NACL)
 // static
 bool FieldTrialList::CreateTrialsFromDescriptor(int fd_key) {
   if (!kUseSharedMemoryForFieldTrials)
     return false;
 
   if (fd_key == -1)
     return false;
 
   int fd = GlobalDescriptors::GetInstance()->MaybeGet(fd_key);
   if (fd == -1)
     return false;
 
-  SharedMemoryHandle shm_handle(FileDescriptor(fd, true));
+  // TODO(erikchen): Plumb a GUID for this SharedMemoryHandle.
+  // https://crbug.com/713763.
+  SharedMemoryHandle shm_handle(FileDescriptor(fd, true),
+                                base::UnguessableToken::Create());
 
   bool result = FieldTrialList::CreateTrialsFromSharedMemoryHandle(shm_handle);
   DCHECK(result);
   return true;
 }
 #endif
 
 // static
 bool FieldTrialList::CreateTrialsFromSharedMemoryHandle(
     SharedMemoryHandle shm_handle) {
@@ skipping 184 matching lines @@
     return;
   }
   AutoLock auto_lock(global_->lock_);
   CHECK(!global_->PreLockedFind(trial->trial_name())) << trial->trial_name();
   trial->AddRef();
   trial->SetTrialRegistered();
   global_->registered_[trial->trial_name()] = trial;
 }
 
 }  // namespace base