Gardening: Update to latest revision.
Enable support for Ash.

Support for ASH is part of Chromium-X11 and we should start using it by
default. This CL adds needed support for enabling ASH and also updated
the README instructions.
Media: Remove un-used wl_display in TFPPicture.
Media: Avoid initializing display connection in VaapiVideoDecodeAccelerator.

VaapiVideoDecodeAccelerator initializes a new Wayland Display connection,
instead it should try to reuse the already existing Display connection.
This patch changes it so that VaapiVideoDecodeAccelerator queries native
display via GetPlatformDefaultEGLNativeDisplay and uses it.