Fix V4L2 device failed to create on veyron board

media/gpu/v4l2_device.cc

Index: media/gpu/v4l2_device.cc
diff --git a/media/gpu/v4l2_device.cc b/media/gpu/v4l2_device.cc
index d80989d84f47a7d8aba1578a7fce241c6faa3831..dcd8f596ff192bfce4b99343b98a0847f9f8f25c 100644
--- a/media/gpu/v4l2_device.cc
+++ b/media/gpu/v4l2_device.cc
@@ -20,6 +20,15 @@ V4L2Device::V4L2Device(Type type) : type_(type) {}
 V4L2Device::~V4L2Device() {}
 
 // static
+bool V4L2Device::IsUsingLibV4L2() {
+#if defined(USE_LIBV4L2)
+  return true;
+#else
+  return false;
+#endif
+}
+
+// static
 scoped_refptr<V4L2Device> V4L2Device::Create(Type type) {
   DVLOG(3) << __PRETTY_FUNCTION__;