Make native accessors sleep for 1ms before measuring elapsed time. This is to check the theory that we cannot pause profiled thread on Win64 for some reason and miss many samples.

BUG=None
TBR=jkummerow@chromium.org

Review URL: https://codereview.chromium.org/16656003

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15016 ce2b1a6d-e550-0410-aec6-3dcde31c8c00