Add getVersion and setLibraryDebuggable RPCs to the service protocol.

runtime/vm/service/service.md

 # Dart VM Service Protocol 0.0
 
 This document describes _version 0.0_ 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.
 It is possible to make HTTP (non-WebSocket) requests,
 but this does not allow access to VM _events_ and is not documented
@@ skipping 20 matching lines @@
         - [getFlagList](#getflaglist)
         - [getIsolate](#getisolate)
         - [getObject](#getobject)
         - [getStack](#getstack)
         - [getVersion](#getversion)
         - [getVM](#getvm)
         - [pause](#pause)
         - [removeBreakpoint](#removebreakpoint)
         - [resume](#resume)
         - [setName](#setname)
+        - [setLibraryDebuggable](#setlibrarydebuggable)
         - [streamCancel](#streamcancel)
         - [streamListen](#streamlisten)
 - [Public Types](#public-types)
         - [Bool](#bool)
         - [BoundField](#boundfield)
         - [BoundVariable](#boundvariable)
         - [Breakpoint](#breakpoint)
         - [Class](#class)
         - [ClassList](#classlist)
         - [Code](#code)
@@ skipping 505 matching lines @@
 
 ```
 Success setName(string isolateId,
                 string name)
 ```
 
 The _setName_ RPC is used to change the debugging name for an isolate.
 
 See [Success](#success).
 
+### setLibraryDebuggable
+
+```
+Success setLibraryDebuggable(string isolateId,
+                             string libraryId,
+                             bool isDebuggable)
+```
+
+The _setLibraryDebuggable_ RPC is used to enable or disable whether
+breakpoints and stepping work for a given library.
+
+See [Success](#success).
+
 ### streamCancel
 
 ```
 Success streamCancel(string streamId)
 ```
 
 The _streamCancel_ RPC cancels a stream subscription in the VM.
 
 If the client is not subscribed to the stream, the _102_ (Stream not
 subscribed) error code is returned.
@@ skipping 713 matching lines @@
 _@Library_ is a reference to a _Library_.
 
 ```
 class Library extends Object {
   // The name of this library.
   string name;
 
   // The uri of this library.
   string uri;
 
+  // Is this library debuggable?  Default true.
+  bool debuggable;
+
   // A list of the imports for this library.
   @Library[] imports;
 
   // A list of the scripts which constitute this library.
   @Script[] scripts;
 
   // A list of the top-level variables in this library.
   @Field[] variables;
 
   // A list of the top-level functions in this library.
   @Function[] functions;
 
   // A list of all classes in this library.
   @Class[] classes;
 }
 ```
 
 A _Library_ provides information about a Dart language library.
 
+See [setLibraryDebuggable](#setlibrarydebuggable).
+
 ### List
 
 ```
 class @List extends @Instance {
   // The length of this list.
   int length;
 }
 ```
 
 _@List_ is a reference to a _List_.
@@ skipping 357 matching lines @@
   // A list of isolates running in the VM.
   @Isolate[] isolates
 }
 ```
 
 ## Revision History
 
 version | comments
 ------- | --------
 0.0 | draft