Reland "Merge more Kernel infrastructure from kernel_sdk SDK fork."

tests/kernel/unsorted/this_capture_test.dart

+// Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+import 'expect.dart';
+
+class Foo {
+  capture() {
+    return () {
+      return this;
+    };
+  }
+
+  captureFirst(a, b) {
+    return () {
+      print(a);
+      return this;
+    };
+  }
+
+  captureLast(a, b) {
+    return () {
+      print(b);
+      return this;
+    };
+  }
+}
+
+main() {
+  var foo = new Foo();
+  Expect.isTrue(identical(foo, (foo.capture())()));
+  Expect.isTrue(identical(foo, (foo.captureFirst(1, 2))()));
+  Expect.isTrue(identical(foo, (foo.captureLast(1, 2))()));
+}