Sampler::syncState now returns angle::Result This is a foundational refactor in preparation for implementing sampler objects in the Vulkan backend. Bug: angleproject:3208 Change-Id: I5970f141d3f825aee1f8b713be8e162c7d0f8bbe Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1710961 Reviewed-by: Jamie Madill <jmadill@chromium.org> Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org> Commit-Queue: Tobin Ehlis <tobine@google.com>