Add NativePixmapHandle type & interface for exporting them

ui/gfx/native_pixmap_handle_ozone.h

+// Copyright 2015 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.
+
+#ifndef UI_GFX_NATIVE_PIXMAP_HANDLE_OZONE_H_
+#define UI_GFX_NATIVE_PIXMAP_HANDLE_OZONE_H_
+
+#include "base/file_descriptor_posix.h"
+
+namespace gfx {
+
+struct NativePixmapHandle {

[vignatti (out of this project), 2015/08/06 17:30:18]

class instead?

[spang, 2015/08/06 20:53:29]

struct

This is a topic in the style guide, please review it there.

[spang, 2015/08/06 21:04:15]

Ah I see why you pointed out. Fixed bad forward declaration, thanks.

+  // A file descriptor for the underlying memory object (usually dmabuf).
+  base::FileDescriptor fd;
+
+  // The stride to used when accessing the buffer via a memory mapping.
+  int32_t stride = 0;
+};
+
+}  // namespace gfx
+
+#endif  // UI_GFX_NATIVE_PIXMAP_HANDLE_OZONE_H_