Import Chromium base/numerics to resolve integer overflow.

We'll use this for integer overflows going forward.

BUG=382606
R=bo_xu@foxitsoftware.com, jschuh@chromium.org

Review URL: https://codereview.chromium.org/341533007

1 files changed, 33 insertions, 0 deletions

diff --git a/third_party/template_util.h b/third_party/template_util.h
new file mode 100644
index 0000000000..d4508dd696
--- /dev/null
+++ b/third_party/template_util.h
@@ -0,0 +1,33 @@
+// Copyright (c) 2011 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_TEMPLATE_UTIL_H_
+#define BASE_TEMPLATE_UTIL_H_
+
+#include <cstddef>  // For size_t.
+
+namespace base {
+
+template<class T, T v>
+struct integral_constant {
+  static const T value = v;
+  typedef T value_type;
+  typedef integral_constant<T, v> type;
+};
+
+typedef integral_constant<bool, true> true_type;
+typedef integral_constant<bool, false> false_type;
+
+template <class T, class U> struct is_same : public false_type {};
+template <class T> struct is_same<T,T> : true_type {};
+
+template<bool B, class T = void>
+struct enable_if {};
+
+template<class T>
+struct enable_if<true, T> { typedef T type; };
+
+}  // namespace base
+
+#endif  // BASE_TEMPLATE_UTIL_H_