Add a Mojo EDK for Chrome that uses one OS pipe per message pipe.

mojo/edk/system/memory.cc

 // Copyright 2013 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 "mojo/edk/system/memory.h"
 
 #include <limits>
 
 #include "base/logging.h"
 #include "build/build_config.h"
 
 namespace mojo {
-namespace system {
+namespace edk {
 namespace internal {
 
 template <size_t alignment>
 bool IsAligned(const void* pointer) {
   return reinterpret_cast<uintptr_t>(pointer) % alignment == 0;
 }
 
 // MSVS (2010, 2013) sometimes (on the stack) aligns, e.g., |int64_t|s (for
 // which |__alignof(int64_t)| is 8) to 4-byte boundaries. http://goo.gl/Y2n56T
 #if defined(COMPILER_MSVC) && defined(ARCH_CPU_32_BITS)
@@ skipping 54 matching lines @@
 CheckUserPointerWithSize<8>(const void* pointer, size_t size) {
   CHECK(size == 0 ||
         (!!pointer && reinterpret_cast<uintptr_t>(pointer) % 8 == 0));
 }
 #else
 template void MOJO_SYSTEM_IMPL_EXPORT
 CheckUserPointerWithSize<8>(const void*, size_t);
 #endif
 
 }  // namespace internal
-}  // namespace system
+}  // namespace edk
 }  // namespace mojo