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added check for window in Common.now
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@ -257,7 +257,7 @@ module.exports = Common;
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* @return {number} the current timestamp
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* @return {number} the current timestamp
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*/
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*/
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Common.now = function() {
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Common.now = function() {
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if (window.performance) {
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if (typeof window !== 'undefined' && window.performance) {
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if (window.performance.now) {
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if (window.performance.now) {
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return window.performance.now();
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return window.performance.now();
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} else if (window.performance.webkitNow) {
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} else if (window.performance.webkitNow) {
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