Import wpt@758b3b4cfa805067f36121333ba031e583d3a62c

third_party/WebKit/LayoutTests/external/wpt/preload/resources/preload_helper.js

Index: third_party/WebKit/LayoutTests/external/wpt/preload/resources/preload_helper.js
diff --git a/third_party/WebKit/LayoutTests/external/wpt/preload/resources/preload_helper.js b/third_party/WebKit/LayoutTests/external/wpt/preload/resources/preload_helper.js
new file mode 100644
index 0000000000000000000000000000000000000000..50c88126cd5f0541856dc7c2d3b1d51d51aa1a57
--- /dev/null
+++ b/third_party/WebKit/LayoutTests/external/wpt/preload/resources/preload_helper.js
@@ -0,0 +1,16 @@
+function verifyPreloadAndRTSupport()
+{
+    var link = window.document.createElement("link");
+    assert_true(link.relList && link.relList.supports("preload"), "Preload not supported");
+    assert_true(!!window.PerformanceResourceTiming, "ResourceTiming not supported");
+}
+
+function getAbsoluteURL(url)
+{
+    return new URL(url, location.href).href;
+}
+
+function verifyNumberOfDownloads(url, number)
+{
+    assert_equals(performance.getEntriesByName(getAbsoluteURL(url)).length, number, url);
+}