diff -r 000000000000 -r 6474c204b198 ipc/chromium/src/chrome/common/transport_dib_mac.cc
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ipc/chromium/src/chrome/common/transport_dib_mac.cc	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,65 @@
+// Copyright (c) 2009 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 "chrome/common/transport_dib.h"
+
+#include <unistd.h>
+#include <sys/stat.h>
+
+#include "base/eintr_wrapper.h"
+#include "base/shared_memory.h"
+
+TransportDIB::TransportDIB()
+    : size_(0) {
+}
+
+TransportDIB::TransportDIB(TransportDIB::Handle dib)
+    : shared_memory_(dib, false /* read write */),
+      size_(0) {
+}
+
+TransportDIB::~TransportDIB() {
+}
+
+// static
+TransportDIB* TransportDIB::Create(size_t size, uint32_t sequence_num) {
+  TransportDIB* dib = new TransportDIB;
+  if (!dib->shared_memory_.Create("", false /* read write */,
+                                  false /* do not open existing */, size)) {
+    delete dib;
+    return NULL;
+  }
+
+  dib->size_ = size;
+  return dib;
+}
+
+// static
+TransportDIB* TransportDIB::Map(TransportDIB::Handle handle) {
+  TransportDIB* dib = new TransportDIB(handle);
+  struct stat st;
+  fstat(handle.fd, &st);
+
+  if (!dib->shared_memory_.Map(st.st_size)) {
+    delete dib;
+    HANDLE_EINTR(close(handle.fd));
+    return nullptr;
+  }
+
+  dib->size_ = st.st_size;
+
+  return dib;
+}
+
+void* TransportDIB::memory() const {
+  return shared_memory_.memory();
+}
+
+TransportDIB::Id TransportDIB::id() const {
+  return shared_memory_.id();
+}
+
+TransportDIB::Handle TransportDIB::handle() const {
+  return shared_memory_.handle();
+}