gfx: Struct traits for GpuMemoryBufferHandle.

ui/gfx/mojo/buffer_types.mojom

 // 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.
 
 module gfx.mojom;
 
 // gfx::BufferFormat
 enum BufferFormat {
   ATC,
   ATCIA,
@@ skipping 31 matching lines @@
   IO_SURFACE_BUFFER,
   SURFACE_TEXTURE_BUFFER,
   OZONE_NATIVE_PIXMAP,
   LAST = OZONE_NATIVE_PIXMAP
 };
 
 // gfx::GpuMemoryBufferId
 struct GpuMemoryBufferId {
   int32 id;
 };
+
+// gfx::NativePixmapPlane
+struct NativePixmapPlane {
+  uint32 stride;
+  int32 offset;
+  uint64 modifier;
+};
+
+// gfx::NativePixmapHandle
+struct NativePixmapHandle {
+  // A file descriptor for the underlying memory object (usually dmabuf).
+  array<handle> fds;
+
+  array<NativePixmapPlane> planes;
+};
+
+// gfx::GpuMemoryBufferHandle
+struct GpuMemoryBufferHandle {
+  GpuMemoryBufferType type;
+  GpuMemoryBufferId id;
+  handle shared_memory_handle;
+  uint32 offset;
+  uint32 stride;
+  NativePixmapHandle? native_pixmap_handle;
+  // TODO: Add support for mach_port on mac.
+};