components/metrics: Add runtime memory leak detector

third_party/tcmalloc/chromium/src/spin_lock_wrapper.cc

+// Copyright 2015 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 <gperftools/spin_lock_wrapper.h>
+
+#include <new>
+
+#include "base/logging.h"
+#include "base/spinlock.h"
+#include <gperftools/custom_allocator.h>
+
+SpinLockWrapper::SpinLockWrapper() {
+  CHECK(CustomAllocator::IsInitialized());
+  lock_ = new(CustomAllocator::Allocate(sizeof(SpinLock))) SpinLock;
+}
+
+SpinLockWrapper::~SpinLockWrapper() {
+  lock_->~SpinLock();
+  CustomAllocator::Free(lock_, sizeof(*lock_));
+  lock_ = nullptr;
+}
+
+void SpinLockWrapper::Lock() {
+  lock_->Lock();
+}
+
+void SpinLockWrapper::Unlock() {
+  lock_->Unlock();
+}