Add WebSockets to Observatory.

runtime/bin/vmservice/client/lib/src/elements/io_view.dart

Index: runtime/bin/vmservice/client/lib/src/elements/io_view.dart
diff --git a/runtime/bin/vmservice/client/lib/src/elements/io_view.dart b/runtime/bin/vmservice/client/lib/src/elements/io_view.dart
index 0016d8347f60ec5bc09e60b8f4b146bd6196b288..431fa25c924022014328b3f69b7de6da1f4643e6 100644
--- a/runtime/bin/vmservice/client/lib/src/elements/io_view.dart
+++ b/runtime/bin/vmservice/client/lib/src/elements/io_view.dart
@@ -99,6 +99,33 @@ class IOSocketViewElement extends ObservatoryElement {
   }
 }
 
+@CustomTag('io-web-socket-ref')
+class IOWebSocketRefElement extends ServiceRefElement {
+  IOWebSocketRefElement.created() : super.created();
+}
+
+@CustomTag('io-web-socket-list-view')
+class IOWebSocketListViewElement extends ObservatoryElement {
+  @published ServiceMap list;
+
+  IOWebSocketListViewElement.created() : super.created();
+
+  void refresh(var done) {
+    list.reload().whenComplete(done);
+  }
+}
+
+@CustomTag('io-web-socket-view')
+class IOWebSocketViewElement extends ObservatoryElement {
+  @published ServiceMap webSocket;
+
+  IOWebSocketViewElement.created() : super.created();
+
+  void refresh(var done) {
+    webSocket.reload().whenComplete(done);
+  }
+}
+
 @CustomTag('io-random-access-file-list-view')
 class IORandomAccessFileListViewElement extends ObservatoryElement {
   @published ServiceMap list;
@@ -201,4 +228,4 @@ class IOProcessViewElement extends ObservatoryElement {
       _updateTimer = null;
     }
   }
-}
+}