Migrate all LayoutTests/dart/dom to main repo.

client/tests/client/dom/IsolatesTest.dart

Index: client/tests/client/dom/IsolatesTest.dart
diff --git a/client/tests/client/dom/IsolatesTest.dart b/client/tests/client/dom/IsolatesTest.dart
new file mode 100644
index 0000000000000000000000000000000000000000..7f062ab0778c59d8c82309db3f7aa98aa40cee77
--- /dev/null
+++ b/client/tests/client/dom/IsolatesTest.dart
@@ -0,0 +1,52 @@
+#library('IsolatesTest');
+#import('../../../testing/unittest/unittest.dart');
+#import('dart:dom');
+#import('dart:json');
+
+class PingPongIsolate extends Isolate {
+  PingPongIsolate() : super.heavy();
+
+  void main() {
+    bool wasThrown = false;
+    try {
+      window.alert('Test');
+    } catch(final e) {
+      wasThrown = true;
+    }
+    // If wasn't thrown, do not listen to messages to make test fail.
+    if (!wasThrown) {
+      return;
+    }
+
+    // Check that JSON library was loaded to isolate.
+    JSON.stringify([1, 2, 3]);
+
+    port.receive((message, replyTo) {
+      replyTo.send(responseFor(message), null);
+    });
+  }
+
+  static String responseFor(message) => 'response for $message';
+}
+
+main() {
+  forLayoutTests();
+  asyncTest('IsolateSpawn', 1, () {
+    new PingPongIsolate().spawn().then((SendPort port) {
+      callbackDone();
+    });
+  });
+  asyncTest('NonDOMIsolates', 1, () {
+    new PingPongIsolate().spawn().then((SendPort port) {
+      final msg1 = 'foo';
+      final msg2 = 'bar';
+      port.call(msg1).receive((response, _) {
+        Expect.equals(PingPongIsolate.responseFor(msg1), response);
+        port.call(msg2).receive((response, _) {
+          Expect.equals(PingPongIsolate.responseFor(msg2), response);
+          callbackDone();
+        });
+      });
+    });
+  });
+}