Validate texture parameters for >0 after rounding. From the spec (2.3.1 Data Conversion For State-Setting Commands): "Validation of values performed by state-setting commands is performed after conversion, unless specified otherwise for a specific command." BUG=783574 Change-Id: I9edf585a17489ad284bc85a1c3c2236b53ee34d9 Reviewed-on: https://chromium-review.googlesource.com/766569 Reviewed-by: Corentin Wallez <cwallez@chromium.org> Commit-Queue: Geoff Lang <geofflang@chromium.org>