First step of HTMLImports

LayoutTests/fast/html/imports/resources/import-helpers.js

Index: LayoutTests/fast/html/imports/resources/import-helpers.js
diff --git a/LayoutTests/fast/html/imports/resources/import-helpers.js b/LayoutTests/fast/html/imports/resources/import-helpers.js
new file mode 100644
index 0000000000000000000000000000000000000000..e7dce60cb1fc4df9eef3940b3f80fc909e39e31d
--- /dev/null
+++ b/LayoutTests/fast/html/imports/resources/import-helpers.js
@@ -0,0 +1,48 @@
+
+
+function waitAndTest(tests)
+{
+    window.jsTestIsAsync = true;
+
+    function runNext()
+    {
+        var options = tests.shift();
+        if (!options)
+            return finishJSTest();
+        return runSingleTest(options);
+    }
+
+    function runSingleTest(options)
+    {
+        var ntries = 10;
+        function checkWhenReady()
+        {
+            if (--ntries < 0) {
+                testFailed("Timed out");
+                return finishJSTest();
+            }
+
+            if (!options.ready())
+                return setTimeout(checkWhenReady, 0);
+
+            options.test();
+            return runNext();
+        }
+
+        debug(options.description);
+        if (options.setup)
+            options.setup();
+        checkWhenReady();
+    }
+
+    window.setTimeout(runNext, 0);
+}
+
+function createPlaceholder()
+{
+    var link = document.createElement("link");
+    link.setAttribute("href", "resources/placeholder.html");
+    link.setAttribute("rel", "import");
+    document.head.appendChild(link);
+    return link;
+}