Make SharedMemoryHandle a class on Mac.

ipc/ipc_message_utils.cc

Index: ipc/ipc_message_utils.cc
diff --git a/ipc/ipc_message_utils.cc b/ipc/ipc_message_utils.cc
index f86022c691a09cded39dc2cd21928bcaca8b9646..52abd08e5ce0f716fd697900ec3acb2f9ac2b849 100644
--- a/ipc/ipc_message_utils.cc
+++ b/ipc/ipc_message_utils.cc
@@ -20,6 +20,10 @@
 #include "ipc/ipc_platform_file_attachment_posix.h"
 #endif
 
+#if defined(OS_MACOSX) && !defined(OS_IOS)
+#include "base/memory/shared_memory_handle.h"
+#endif  // defined(OS_MACOSX) && !defined(OS_IOS)
+
 #if defined(OS_WIN)
 #include <tchar.h>
 #endif
@@ -516,6 +520,44 @@ void ParamTraits<base::FileDescriptor>::Log(const param_type& p,
 }
 #endif  // defined(OS_POSIX)
 
+#if defined(OS_MACOSX) && !defined(OS_IOS)
+void ParamTraits<base::SharedMemoryHandle>::Write(Message* m,
+                                                  const param_type& p) {
+  uint32_t mechanism = p.GetMechanismForWire();
+  WriteParam(m, mechanism);
+
+  if (p.IsBackedByPOSIXFd())
+    ParamTraits<base::FileDescriptor>::Write(m, *p.GetFileDescriptor());
+}
+
+bool ParamTraits<base::SharedMemoryHandle>::Read(const Message* m,
+                                                 base::PickleIterator* iter,
+                                                 param_type* r) {
+  uint32_t mechanism;
+  if (!ReadParam(m, iter, &mechanism))
+    return false;
+
+  bool success = r->SetMechanismFromWire(mechanism);
+  if (!success)
+    return false;
+
+  if (r->IsBackedByPOSIXFd()) {
+    return ParamTraits<base::FileDescriptor>::Read(m, iter,
+                                                   r->GetFileDescriptor());
+  }
+
+  return true;
+}
+
+void ParamTraits<base::SharedMemoryHandle>::Log(const param_type& p,
+                                                std::string* l) {
+  if (p.IsBackedByPOSIXFd()) {
+    l->append(base::StringPrintf("Mechanism POSIX Fd"));
+    ParamTraits<base::FileDescriptor>::Log(*p.GetFileDescriptor(), l);
+  }
+}
+#endif
+
 void ParamTraits<base::FilePath>::Write(Message* m, const param_type& p) {
   p.WriteToPickle(m);
 }