Workaround for undeclared identifier V4L2_PIX_FMT_INVZ.

media/capture/video/linux/v4l2_capture_delegate.cc

 // 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.
 
 #include "media/capture/video/linux/v4l2_capture_delegate.h"
 
 #include <linux/version.h>
 #include <poll.h>
 #include <sys/fcntl.h>
 #include <sys/ioctl.h>
 #include <sys/mman.h>
 #include <utility>
 
 #include "base/bind.h"
 #include "base/files/file_enumerator.h"
 #include "base/posix/eintr_wrapper.h"
 #include "base/strings/stringprintf.h"
 #include "build/build_config.h"
 #include "media/base/bind_to_current_loop.h"
 #include "media/capture/video/blob_utils.h"
 #include "media/capture/video/linux/video_capture_device_linux.h"
 
 #if LINUX_VERSION_CODE < KERNEL_VERSION(4, 6, 0)
 // 16 bit depth, Realsense F200.
 #define V4L2_PIX_FMT_Z16 v4l2_fourcc('Z', '1', '6', ' ')
+#endif
+
+// TODO(aleksandar.stojiljkovic): Wrap this with kernel version check once the
+// format is introduced to kernel.
+// See https://crbug.com/661877
+#ifndef V4L2_PIX_FMT_INVZ
 // 16 bit depth, Realsense SR300.
 #define V4L2_PIX_FMT_INVZ v4l2_fourcc('I', 'N', 'V', 'Z')
 #endif
 
 namespace media {
 
 // Desired number of video buffers to allocate. The actual number of allocated
 // buffers by v4l2 driver can be higher or lower than this number.
 // kNumVideoBuffers should not be too small, or Chrome may not return enough
 // buffers back to driver in time.
@@ skipping 601 matching lines @@
     DLOG(ERROR) << "Error mmap()ing a V4L2 buffer into userspace";
     return false;
   }
   start_ = static_cast<uint8_t*>(start);
   length_ = buffer.length;
   payload_size_ = 0;
   return true;
 }
 
 }  // namespace media