Add TypedData instance kinds.

runtime/vm/service/service.md

 # Dart VM Service Protocol 1.0 (Draft 1)
 
 > Please post feedback to the [observatory-discuss group][discuss-list]
 
 This document describes _draft 1_ of _version 1.0_ of the Dart VM
 Service Protocol.  This protocol is used to communicate with a running
 Dart Virtual Machine.
 
 To use the Service Protocol, start the VM with the *--observe* flag.
 The VM will start a webserver which services protocol requests via WebSocket.
@@ skipping 1211 matching lines @@
   string valueAsString [optional];
 
   // The valueAsString for String references may be truncated. If so,
   // this property is added with the value 'true'.
   bool valueAsStringIsTruncated [optional];
 
   // The length of a List instance.
   //
   // Provided for instance kinds:
   //   List
+  //   Map
+  //   TypedData
   int length [optional];
 
   // The name of a Type instance.
   //
   // Provided for instance kinds:
   //   Type
   string name [optional];
 
   // The corresponding Class if this Type is canonical.
   //
@@ skipping 29 matching lines @@
   string valueAsString [optional];
 
   // The valueAsString for String references may be truncated. If so,
   // this property is added with the value 'true'.
   bool valueAsStringIsTruncated [optional];
 
   // The length of a List instance.
   //
   // Provided for instance kinds:
   //   List
+  //   Map
+  //   TypedData
   int length [optional];
 
   // The name of a Type instance.
   //
   // Provided for instance kinds:
   //   Type
   string name [optional];
 
   // The corresponding Class if this Type is canonical.
   //
@@ skipping 15 matching lines @@
   // Provided for instance kinds:
   //   List
   @Instance|Sentinel[] elements [optional];
 
   // The elements of a List instance.
   //
   // Provided for instance kinds:
   //   Map
   MapAssociation[] associations [optional];
 
+  // The bytes of a TypedData instance.
+  //
+  // Provided for instance kinds:
+  //   TypedData
+  int[] bytes [optional];
+
   // The function associated with a Closure instance.
   //
   // Provided for instance kinds:
   //   Closure
   @Function closureFunction [optional];
 
   // The context associated with a Closure instance.
   //
   // Provided for instance kinds:
   //   Closure
@@ skipping 78 matching lines @@
   String,
 
   // An instance of the built-in VM List implementation. User-defined
   // Lists will be PlainInstance.
   List,
 
   // An instance of the built-in VM Map implementation. User-defined
   // Maps will be PlainInstance.
   Map,
 
+  // An instance of the built-in VM TypedData implementations.  User-defined
+  // TypedDatas will be PlainInstance.
+  TypedData,
+
   // An instance of the built-in VM Closure implementation. User-defined
   // Closures will be PlainInstance.
   Closure,
 
   // An instance of the Dart class MirrorReference.
   MirrorReference,
 
   // An instance of the Dart class WeakProperty.
   WeakProperty,
 
@@ skipping 455 matching lines @@
 ```
 
 ## Revision History
 
 version | comments
 ------- | --------
 1.0 draft 1 | initial revision
 
 
 [discuss-list]: https://groups.google.com/a/dartlang.org/forum/#!forum/observatory-discuss