Migrate all LayoutTests/dart/dom to main repo.

client/tests/client/dom/PerformanceApiTest.dart

Index: client/tests/client/dom/PerformanceApiTest.dart
diff --git a/client/tests/client/dom/PerformanceApiTest.dart b/client/tests/client/dom/PerformanceApiTest.dart
new file mode 100644
index 0000000000000000000000000000000000000000..022ab68bf27db5df755882676194a82f9331ef92
--- /dev/null
+++ b/client/tests/client/dom/PerformanceApiTest.dart
@@ -0,0 +1,20 @@
+#library('PerformanceApiTest');
+#import('../../../testing/unittest/unittest.dart');
+#import('dart:dom');
+
+main() {
+  forLayoutTests();
+  test('PerformanceApi', () {
+    // Check that code below will not throw exceptions.
+    var requestStart = window.performance.timing.requestStart;
+    var responseStart = window.performance.timing.responseStart;
+    var responseEnd = window.performance.timing.responseEnd;
+    
+    var loading = window.performance.timing.domLoading;
+    var loadedStart = window.performance.timing.domContentLoadedEventStart;
+    var loadedEnd = window.performance.timing.domContentLoadedEventEnd;
+    var complete = window.performance.timing.domComplete;
+
+    var loadEventStart = window.performance.timing.loadEventStart;
+  });
+}