Fix V4L2 device failed to create on veyron board

media/gpu/v4l2_device.h

 // Copyright 2014 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.
 //
 // This file defines the V4L2Device interface which is used by the
 // V4L2DecodeAccelerator class to delegate/pass the device specific
 // handling of any of the functionalities.
 
 #ifndef MEDIA_GPU_V4L2_DEVICE_H_
 #define MEDIA_GPU_V4L2_DEVICE_H_
@@ skipping 33 matching lines @@
   // Convert format requirements requested by a V4L2 device to gfx::Size.
   static gfx::Size CodedSizeFromV4L2Format(struct v4l2_format format);
 
   enum Type {
     kDecoder,
     kEncoder,
     kImageProcessor,
     kJpegDecoder,
   };
 
+  // Returns true if V4L2 device of this platform requires libv4l2.
+  static bool IsUsingLibV4L2();

[Mark Dittmer, 2016/05/04 15:04:41]

Does this also need MEDIA_GPU_EXPORT?

+
   // Creates and initializes an appropriate V4L2Device of |type| for the
   // current platform and returns a scoped_refptr<V4L2Device> on success, or
   // NULL.
   static scoped_refptr<V4L2Device> Create(Type type);
 
   // Parameters and return value are the same as for the standard ioctl() system
   // call.
   virtual int Ioctl(int request, void* arg) = 0;
 
   // This method sleeps until either:
@@ skipping 88 matching lines @@
   friend class base::RefCountedThreadSafe<V4L2Device>;
   explicit V4L2Device(Type type);
   virtual ~V4L2Device();
 
   const Type type_;
 };
 
 }  //  namespace media
 
 #endif  // MEDIA_GPU_V4L2_DEVICE_H_