Add Observatory support for UnlinkedCall, SingleTargetCache and SubtypeTestCache.

runtime/observatory/lib/src/elements/subtypetestcache_ref.dart

Index: runtime/observatory/lib/src/elements/subtypetestcache_ref.dart
diff --git a/runtime/observatory/lib/src/elements/subtypetestcache_ref.dart b/runtime/observatory/lib/src/elements/subtypetestcache_ref.dart
new file mode 100644
index 0000000000000000000000000000000000000000..9dbde53bcda0ac94a9a48e0ac5ac8117da85847d
--- /dev/null
+++ b/runtime/observatory/lib/src/elements/subtypetestcache_ref.dart
@@ -0,0 +1,65 @@
+// Copyright (c) 2017, 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 'dart:html';
+import 'dart:async';
+import 'package:observatory/models.dart' as M
+    show IsolateRef, SubtypeTestCacheRef;
+import 'package:observatory/src/elements/helpers/rendering_scheduler.dart';
+import 'package:observatory/src/elements/helpers/tag.dart';
+import 'package:observatory/src/elements/helpers/uris.dart';
+
+class SubtypeTestCacheRefElement extends HtmlElement implements Renderable {
+  static const tag =
+      const Tag<SubtypeTestCacheRefElement>('subtypetestcache-ref');
+
+  RenderingScheduler<SubtypeTestCacheRefElement> _r;
+
+  Stream<RenderedEvent<SubtypeTestCacheRefElement>> get onRendered =>
+      _r.onRendered;
+
+  M.IsolateRef _isolate;
+  M.SubtypeTestCacheRef _subtypeTestCache;
+
+  M.IsolateRef get isolate => _isolate;
+  M.SubtypeTestCacheRef get subtypeTestCache => _subtypeTestCache;
+
+  factory SubtypeTestCacheRefElement(
+      M.IsolateRef isolate, M.SubtypeTestCacheRef subtypeTestCache,
+      {RenderingQueue queue}) {
+    assert(isolate != null);
+    assert(subtypeTestCache != null);
+    SubtypeTestCacheRefElement e = document.createElement(tag.name);
+    e._r = new RenderingScheduler(e, queue: queue);
+    e._isolate = isolate;
+    e._subtypeTestCache = subtypeTestCache;
+    return e;
+  }
+
+  SubtypeTestCacheRefElement.created() : super.created();
+
+  @override
+  void attached() {
+    super.attached();
+    _r.enable();
+  }
+
+  @override
+  void detached() {
+    super.detached();
+    _r.disable(notify: true);
+    children = [];
+  }
+
+  void render() {
+    children = [
+      new AnchorElement(href: Uris.inspect(_isolate, object: _subtypeTestCache))
+        ..children = [
+          new SpanElement()
+            ..classes = ['emphasize']
+            ..text = 'SubtypeTestCache',
+        ]
+    ];
+  }
+}