Ozone Linux: Fix build errors with chromeos==0 ozone_platform_drm=true

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 <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(OS_CHROMEOS)
+#if defined(USE_OZONE)

[tonikitoo, 2016/11/08 13:45:37]

quick post mortem note: checking USE_OZONE seems redundant here since, the file
is within //ui/ozone, so it only builds with use_ozone = true.

 // TODO(vignatti): replace the local definitions below with #include
 // <linux/dma-buf.h> once kernel version 4.6 becomes widely used.
 #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)
@@ skipping 83 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