Ozone DRM: Improve inclusions of hardcoded definitions for dma-buf.

ui/ozone/platform/drm/common/client_native_pixmap_dmabuf.cc

 // 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 "ui/ozone/platform/drm/common/client_native_pixmap_dmabuf.h"
 
 #include <fcntl.h>
+#include <linux/version.h>
 #include <stddef.h>
 #include <sys/mman.h>
 #include <xf86drm.h>
 
 #include "base/memory/ptr_util.h"
 #include "base/process/memory.h"
 #include "base/trace_event/trace_event.h"
 
-#if defined(USE_OZONE)
-// TODO(vignatti): replace the local definitions below with #include
-// <linux/dma-buf.h> once kernel version 4.6 becomes widely used.
+#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 6, 0)
 #include <linux/types.h>
 
 struct local_dma_buf_sync {
   __u64 flags;
 };
 
 #define LOCAL_DMA_BUF_SYNC_READ (1 << 0)
 #define LOCAL_DMA_BUF_SYNC_WRITE (2 << 0)
 #define LOCAL_DMA_BUF_SYNC_RW \
   (LOCAL_DMA_BUF_SYNC_READ | LOCAL_DMA_BUF_SYNC_WRITE)
 #define LOCAL_DMA_BUF_SYNC_START (0 << 2)
 #define LOCAL_DMA_BUF_SYNC_END (1 << 2)
 
 #define LOCAL_DMA_BUF_BASE 'b'
 #define LOCAL_DMA_BUF_IOCTL_SYNC \
   _IOW(LOCAL_DMA_BUF_BASE, 0, struct local_dma_buf_sync)
+
+#else
+#include <linux/dma-buf.h>
 #endif
 
 namespace ui {
 
 namespace {
 
 void PrimeSyncStart(int dmabuf_fd) {
   struct local_dma_buf_sync sync_start = {0};
 
   sync_start.flags = LOCAL_DMA_BUF_SYNC_START | LOCAL_DMA_BUF_SYNC_RW;
@@ skipping 65 matching lines @@
   uint8_t* address = reinterpret_cast<uint8_t*>(data_);
   return address + pixmap_handle_.planes[plane].offset;
 }
 
 int ClientNativePixmapDmaBuf::GetStride(size_t plane) const {
   DCHECK_LT(plane, pixmap_handle_.planes.size());
   return pixmap_handle_.planes[plane].stride;
 }
 
 }  // namespace ui