Import PartitionAlloc from Chromium.

We'll add callers in a later CL.

BUG=pdfium:678

Change-Id: I98c8b2832c4750df326218e24ee8c1bd33b89b50
Reviewed-on: https://pdfium-review.googlesource.com/3066
Commit-Queue: Tom Sepez <tsepez@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>

1 files changed, 18 insertions, 0 deletions

diff --git a/third_party/base/allocator/partition_allocator/address_space_randomization.h b/third_party/base/allocator/partition_allocator/address_space_randomization.h
new file mode 100644
index 0000000000..97c5f606dd
--- /dev/null
+++ b/third_party/base/allocator/partition_allocator/address_space_randomization.h
@@ -0,0 +1,18 @@
+// Copyright 2014 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.
+
+#ifndef BASE_ALLOCATOR_PARTITION_ALLOCATOR_ADDRESS_SPACE_RANDOMIZATION
+#define BASE_ALLOCATOR_PARTITION_ALLOCATOR_ADDRESS_SPACE_RANDOMIZATION
+
+namespace pdfium {
+namespace base {
+
+// Calculates a random preferred mapping address. In calculating an address, we
+// balance good ASLR against not fragmenting the address space too badly.
+void* GetRandomPageBase();
+
+}  // namespace base
+}  // namespace pdfium
+
+#endif  // BASE_ALLOCATOR_PARTITION_ALLOCATOR_ADDRESS_SPACE_RANDOMIZATION