With dynamic shaders, we can have multiple vertex shaders in one
program binary. Hence the binary serial by itself isn't enough to
determine when we need to apply new shaders to D3D.

Change-Id: I5a8b8616d353b506790ffc809e2d459bfc2b831d
Reviewed-on: https://chromium-review.googlesource.com/184370Reviewed-by: Geoff Lang <geofflang@chromium.org>
Reviewed-by: Nicolas Capens <nicolascapens@chromium.org>
Commit-Queue: Nicolas Capens <nicolascapens@chromium.org>
Tested-by: Jamie Madill <jmadill@chromium.org>