Roll Google Test. Updates our build files to be more consistent with Chromium. Also rolls SPIRV-Tools to use newer test fixture syntax. Note: requires an update to SPIRV-Tools to pass 'gn check'. Bug: angleproject:3151 Change-Id: I8abddef396f84e5c58cdd185421f03fd6e2b6d58 Reviewed-on: https://chromium-review.googlesource.com/c/1470591 Reviewed-by: Geoff Lang <geofflang@chromium.org> Commit-Queue: Jamie Madill <jmadill@google.com>