New FenceSync object API implementation - Added new FenceSync object and related API functions implementations - Added FenceSync to ResourceManager - Moved Sampler to ResourceManager Change-Id: Ia3d42b749811a4e1ed087b41f0c871beb8fdb8d4 Reviewed-on: https://swiftshader-review.googlesource.com/2931 Tested-by: Alexis Hétu <sugoi@google.com> Reviewed-by: Nicolas Capens <capn@google.com>