Validate that unpack skip is in bounds Unpack skip needs to be taken into account when determining which part of the unpack buffer is read. This is now done in the out-of-bounds check when validating texture upload calls. Unpack skip code is removed from D3D9 backend, since skip is not supported in GLES2. BUG=angleproject:1411 TEST=angle_end2end_tests Change-Id: I0db4db0877a352613c57e2820e5b650edb5a73ab Reviewed-on: https://chromium-review.googlesource.com/352450 Reviewed-by: Jamie Madill <jmadill@chromium.org> Commit-Queue: Olli Etuaho <oetuaho@nvidia.com>