ipc: Write end-to-end tests for SharedMemoryHandle brokering on Mac.

ipc/ipc_test_messages.h

Index: ipc/ipc_test_messages.h
diff --git a/ipc/ipc_test_messages.h b/ipc/ipc_test_messages.h
index 4bf927eb0547f642e795ebd3de11bcbec18eb31c..d1247cbf68312627ea09d464f7e173806f36cea8 100644
--- a/ipc/ipc_test_messages.h
+++ b/ipc/ipc_test_messages.h
@@ -2,13 +2,33 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+// Multiply-included file, no traditional include guard.
 #include "build/build_config.h"
 
-#if defined(OS_WIN)
-#include "ipc/handle_win.h"
 #include "ipc/ipc_message_macros.h"
 #define IPC_MESSAGE_START IPCTestMsgStart
 
+#if defined(OS_WIN)
+#include "ipc/handle_win.h"
+
 IPC_MESSAGE_CONTROL3(TestHandleWinMsg, int, IPC::HandleWin, int)
 IPC_MESSAGE_CONTROL2(TestTwoHandleWinMsg, IPC::HandleWin, IPC::HandleWin)
 #endif  // defined(OS_WIN)
+
+#if defined(OS_MACOSX)
+#include "base/file_descriptor_posix.h"
+#include "base/memory/shared_memory_handle.h"
+
+IPC_MESSAGE_CONTROL3(TestSharedMemoryHandleMsg1,
+                     int,
+                     base::SharedMemoryHandle,
+                     int)
+IPC_MESSAGE_CONTROL2(TestSharedMemoryHandleMsg2,
+                     base::SharedMemoryHandle,
+                     base::SharedMemoryHandle)
+IPC_MESSAGE_CONTROL4(TestSharedMemoryHandleMsg3,
+                     base::FileDescriptor,
+                     base::SharedMemoryHandle,
+                     base::FileDescriptor,
+                     base::SharedMemoryHandle)
+#endif  // defined(OS_MACOSX)