Add functions to check if texture data initialization is required. Change-Id: I54c3b90780c304d6001b9e52278672981c96cb83 Reviewed-on: https://chromium-review.googlesource.com/176853 Reviewed-by: Shannon Woods <shannonwoods@chromium.org> Commit-Queue: Shannon Woods <shannonwoods@chromium.org> Tested-by: Shannon Woods <shannonwoods@chromium.org>