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diff --git a/chromium/third_party/webrtc/base/safe_conversions.h b/chromium/third_party/webrtc/base/safe_conversions.h
new file mode 100644
index 00000000000..f6cb24e4126
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+++ b/chromium/third_party/webrtc/base/safe_conversions.h
@@ -0,0 +1,79 @@
+/*
+ *  Copyright 2014 The WebRTC Project Authors. All rights reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+// Borrowed from Chromium's src/base/numerics/safe_conversions.h.
+
+#ifndef WEBRTC_BASE_SAFE_CONVERSIONS_H_
+#define WEBRTC_BASE_SAFE_CONVERSIONS_H_
+
+#include <limits>
+
+#include "webrtc/base/common.h"
+#include "webrtc/base/logging.h"
+#include "webrtc/base/safe_conversions_impl.h"
+
+namespace rtc {
+
+inline void Check(bool condition) {
+  if (!condition) {
+    LOG(LS_ERROR) << "CHECK failed.";
+    Break();
+    // The program should have crashed at this point.
+  }
+}
+
+// Convenience function that returns true if the supplied value is in range
+// for the destination type.
+template <typename Dst, typename Src>
+inline bool IsValueInRangeForNumericType(Src value) {
+  return internal::RangeCheck<Dst>(value) == internal::TYPE_VALID;
+}
+
+// checked_cast<> is analogous to static_cast<> for numeric types,
+// except that it CHECKs that the specified numeric conversion will not
+// overflow or underflow. NaN source will always trigger a CHECK.
+template <typename Dst, typename Src>
+inline Dst checked_cast(Src value) {
+  Check(IsValueInRangeForNumericType<Dst>(value));
+  return static_cast<Dst>(value);
+}
+
+// saturated_cast<> is analogous to static_cast<> for numeric types, except
+// that the specified numeric conversion will saturate rather than overflow or
+// underflow. NaN assignment to an integral will trigger a CHECK condition.
+template <typename Dst, typename Src>
+inline Dst saturated_cast(Src value) {
+  // Optimization for floating point values, which already saturate.
+  if (std::numeric_limits<Dst>::is_iec559)
+    return static_cast<Dst>(value);
+
+  switch (internal::RangeCheck<Dst>(value)) {
+    case internal::TYPE_VALID:
+      return static_cast<Dst>(value);
+
+    case internal::TYPE_UNDERFLOW:
+      return std::numeric_limits<Dst>::min();
+
+    case internal::TYPE_OVERFLOW:
+      return std::numeric_limits<Dst>::max();
+
+    // Should fail only on attempting to assign NaN to a saturated integer.
+    case internal::TYPE_INVALID:
+      Check(false);
+      return std::numeric_limits<Dst>::max();
+  }
+
+  Check(false); // NOTREACHED();
+  return static_cast<Dst>(value);
+}
+
+}  // namespace rtc
+
+#endif  // WEBRTC_BASE_SAFE_CONVERSIONS_H_