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diff --git a/base/fix_wp64.h b/base/fix_wp64.h
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+// Copyright 2008, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//    * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//    * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//    * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Various inline functions and macros to fix compilation of 32 bit target
+// on MSVC with /Wp64 flag enabled.
+
+#ifndef BASE_FIX_WP64_H__
+#define BASE_FIX_WP64_H__
+
+#include <windows.h>
+
+// Platform SDK fixes when building with /Wp64 for a 32 bits target.
+#if !defined(_WIN64) && defined(_Wp64)
+
+#ifdef InterlockedExchangePointer
+#undef InterlockedExchangePointer
+// The problem is that the macro provided for InterlockedExchangePointer() is
+// doing a (LONG) C-style cast that triggers invariably the warning C4312 when
+// building on 32 bits.
+inline void* InterlockedExchangePointer(void* volatile* target, void* value) {
+  return reinterpret_cast<void*>(static_cast<LONG_PTR>(InterlockedExchange(
+      reinterpret_cast<volatile LONG*>(target),
+      static_cast<LONG>(reinterpret_cast<LONG_PTR>(value)))));
+}
+#endif  // #ifdef InterlockedExchangePointer
+
+#ifdef SetWindowLongPtrA
+#undef SetWindowLongPtrA
+// When build on 32 bits, SetWindowLongPtrX() is a macro that redirects to
+// SetWindowLongX(). The problem is that this function takes a LONG argument
+// instead of a LONG_PTR.
+inline LONG_PTR SetWindowLongPtrA(HWND window, int index, LONG_PTR new_long) {
+  return ::SetWindowLongA(window, index, static_cast<LONG>(new_long));
+}
+#endif  // #ifdef SetWindowLongPtrA
+
+#ifdef SetWindowLongPtrW
+#undef SetWindowLongPtrW
+inline LONG_PTR SetWindowLongPtrW(HWND window, int index, LONG_PTR new_long) {
+  return ::SetWindowLongW(window, index, static_cast<LONG>(new_long));
+}
+#endif  // #ifdef SetWindowLongPtrW
+
+#ifdef GetWindowLongPtrA
+#undef GetWindowLongPtrA
+inline LONG_PTR GetWindowLongPtrA(HWND window, int index) {
+  return ::GetWindowLongA(window, index);
+}
+#endif  // #ifdef GetWindowLongPtrA
+
+#ifdef GetWindowLongPtrW
+#undef GetWindowLongPtrW
+inline LONG_PTR GetWindowLongPtrW(HWND window, int index) {
+  return ::GetWindowLongW(window, index);
+}
+#endif  // #ifdef GetWindowLongPtrW
+
+#ifdef SetClassLongPtrA
+#undef SetClassLongPtrA
+inline LONG_PTR SetClassLongPtrA(HWND window, int index, LONG_PTR new_long) {
+  return ::SetClassLongA(window, index, static_cast<LONG>(new_long));
+}
+#endif  // #ifdef SetClassLongPtrA
+
+#ifdef SetClassLongPtrW
+#undef SetClassLongPtrW
+inline LONG_PTR SetClassLongPtrW(HWND window, int index, LONG_PTR new_long) {
+  return ::SetClassLongW(window, index, static_cast<LONG>(new_long));
+}
+#endif  // #ifdef SetClassLongPtrW
+
+#endif  // #if !defined(_WIN64) && defined(_Wp64)
+
+#endif  // BASE_FIX_WP64_H__