Update VaapiVideoDecodeAccelerator for Wayland

Update Wayland version of VaapiVideoDecodeAccelerator accordingly
to https://codereview.chromium.org/185403020/ in order to make it
build with Chromium 36.0.1976.2.
Merge pull request #158 from pozdnyakov/Update_VaapiVideoDecodeAccelerator_wayland

Update VaapiVideoDecodeAccelerator for Wayland