Vulkan: Make ResourceUse::serial an FastVector of Serials In preparation for per context queue serial, this CL makes ResourceUse::serial a FastVector of Serial. Right now we still limited to one serial index so that it still work the same way as before. This CL adds necessary data type and change the function names to reflect that tracking GPU progress needs a ResourceUse object instead of a single Serial number. Bug: b/255414841 Change-Id: Ic60cdf5ec8da45d1821f65a55947f5c553f65737 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/4034548 Reviewed-by: Yuxin Hu <yuxinhu@google.com> Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org> Commit-Queue: Charlie Lao <cclao@google.com>