1 files changed, 29 insertions, 0 deletions
diff --git a/chromium/base/memory/checked_ptr.cc b/chromium/base/memory/checked_ptr.cc
new file mode 100644
index 00000000000..99f12a34b06
--- /dev/null
+++ b/chromium/base/memory/checked_ptr.cc
@@ -0,0 +1,29 @@
+// Copyright 2020 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/memory/checked_ptr.h"
+
+#include "base/allocator/partition_allocator/partition_alloc.h"
+
+namespace base {
+namespace internal {
+
+#if defined(ARCH_CPU_64_BITS) && !defined(OS_NACL)
+
+BASE_EXPORT bool CheckedPtr2ImplPartitionAllocSupport::EnabledForPtr(
+    void* ptr) {
+  // CheckedPtr2Impl works only when memory is allocated by PartitionAlloc and
+  // only only if the pointer points to the beginning of the allocated slot.
+  //
+  // TODO(bartekn): Add |&& PartitionAllocGetSlotOffset(ptr) == 0|
+  // CheckedPtr2Impl uses a fake implementation at the moment, which happens to
+  // work even for non-0 offsets, so skip this check for now to get a better
+  // coverage.
+  return IsManagedByPartitionAlloc(ptr);
+}
+
+#endif
+
+}  // namespace internal
+}  // namespace base