Import wpt@767dc2a4f049c761bd146d61de2ea860a895a624

third_party/WebKit/LayoutTests/external/wpt/user-timing/resources/webperftestharness.js

Index: third_party/WebKit/LayoutTests/external/wpt/user-timing/resources/webperftestharness.js
diff --git a/third_party/WebKit/LayoutTests/external/wpt/user-timing/resources/webperftestharness.js b/third_party/WebKit/LayoutTests/external/wpt/user-timing/resources/webperftestharness.js
index f1597bbe7f476384291d33f2c616299ce68fc80a..e65b47d8777751e756683fad61e870041ba8b53e 100644
--- a/third_party/WebKit/LayoutTests/external/wpt/user-timing/resources/webperftestharness.js
+++ b/third_party/WebKit/LayoutTests/external/wpt/user-timing/resources/webperftestharness.js
@@ -38,6 +38,21 @@ var timingAttributes = [
 
 var namespace_check = false;
 
+function has_required_interfaces()
+{
+    if (window.performance.mark == undefined ||
+        window.performance.clearMarks == undefined ||
+        window.performance.measure == undefined ||
+        window.performance.clearMeasures == undefined ||
+        window.performance.getEntriesByName == undefined ||
+        window.performance.getEntriesByType == undefined ||
+        window.performance.getEntries == undefined) {
+        return false;
+    }
+
+    return true;
+}
+
 //
 // All test() functions in the WebPerf test suite should use wp_test() instead.
 //