Add Regex isCaseSensitive and isMultiLine to the service protocol and Observatory.

runtime/vm/service/service.md

 # Dart VM Service Protocol 2.0
 
 > Please post feedback to the [observatory-discuss group][discuss-list]
 
 This document describes of _version 2.0_ 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,
@@ skipping 1402 matching lines @@
   // Provided for instance kinds:
   //   MirrorReference
   @Instance mirrorReferent [optional];
 
   // The pattern of a RegExp instance.
   //
   // Provided for instance kinds:
   //   RegExp
   String pattern [optional];
 
+  // Whether this regular expression is case sensitive.
+  //
+  // Provided for instance kinds:
+  //   RegExp
+  bool isCaseSensitive [optional];
+
+  // Whether this regular expression matches multiple lines.
+  //
+  // Provided for instance kinds:
+  //   RegExp
+  bool isMultiLine [optional];
+
   // The key for a WeakProperty instance.
   //
   // Provided for instance kinds:
   //   WeakProperty
   @Instance propertyKey [optional];
 
   // The key for a WeakProperty instance.
   //
   // Provided for instance kinds:
   //   WeakProperty
@@ skipping 558 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