Add mus::mojom::ChannelHandle for passing IPC::ChannelHandle via mojo IPC.

components/mus/gpu/gpu_type_converters.cc

Index: components/mus/gpu/gpu_type_converters.cc
diff --git a/components/mus/gpu/gpu_type_converters.cc b/components/mus/gpu/gpu_type_converters.cc
new file mode 100644
index 0000000000000000000000000000000000000000..ddeed608a2c9fcb2a6774ba1d7ed08a84c97d4a2
--- /dev/null
+++ b/components/mus/gpu/gpu_type_converters.cc
@@ -0,0 +1,53 @@
+// Copyright 2016 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 "components/mus/gpu/gpu_type_converters.h"
+
+#include "ipc/ipc_channel_handle.h"
+#include "mojo/platform_handle/platform_handle_functions.h"
+
+namespace mojo {
+
+// static
+mus::mojom::ChannelHandlePtr
+TypeConverter<mus::mojom::ChannelHandlePtr, IPC::ChannelHandle>::Convert(
+    const IPC::ChannelHandle& handle) {
+  mus::mojom::ChannelHandlePtr result = mus::mojom::ChannelHandle::New();
+  result->name = handle.name;
+#if defined(OS_WIN)
+  // On windows, a pipe handle Will NOT be marshalled over IPC.
+  DCHECK(handle.pipe.handle == NULL);
+#else
+  MojoPlatformHandle platform_handle =
+      handle.socket.fd == -1 ? -1 : dup(handle.socket.fd);
+  MojoHandle mojo_handle = MOJO_HANDLE_INVALID;
+  if (platform_handle != -1) {
+    MojoResult create_result =
+        MojoCreatePlatformHandleWrapper(platform_handle, &mojo_handle);
+    if (create_result == MOJO_RESULT_OK)
+      result->socket.reset(mojo::Handle(mojo_handle));
+  }
+#endif
+  return result;
+}
+
+// static
+IPC::ChannelHandle
+TypeConverter<IPC::ChannelHandle, mus::mojom::ChannelHandlePtr>::Convert(
+    const mus::mojom::ChannelHandlePtr& handle) {
+  if (handle.is_null())
+    return IPC::ChannelHandle();
+#if defined(OS_WIN)
+  // On windows, a pipe handle Will NOT be marshalled over IPC.
+  DCHECK(!handle->socket.is_valid());
+  return IPC::ChannelHandle(handle->name);
+#else
+  MojoPlatformHandle platform_handle = -1;
+  MojoExtractPlatformHandle(handle->socket.release().value(), &platform_handle);
+  return IPC::ChannelHandle(handle->name,
+                            base::FileDescriptor(platform_handle, true));
+#endif
+}
+
+}  // namespace mojo