Upstream high resolution event timestamp test to WPT.
This is in anticipation of DOM spec patch landing [1]. Upstreaming two tests: - verify constructed events get a high-resolution time from perfomance.now() - verify the minimum resolution is larger that 5µs. [1] https://github.com/whatwg/dom/issues/23 [2] https://github.com/whatwg/dom/pull/420 BUG=538600 Review-Url: https://codereview.chromium.org/2744553007 Cr-Commit-Position: refs/heads/master@{#485966}
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