Add crash dumps to service protocol and Observatory

runtime/vm/service/message.dart

Index: runtime/vm/service/message.dart
diff --git a/runtime/vm/service/message.dart b/runtime/vm/service/message.dart
index b4654999c9a8b307cf92beb6fc651c6cbc7fe722..c161e9259bf4b11bb42df09d2dcb0f5e15a5a0b4 100644
--- a/runtime/vm/service/message.dart
+++ b/runtime/vm/service/message.dart
@@ -51,6 +51,16 @@ class Message {
     params.addAll(uri.queryParameters);
   }
 
+  Message.forIsolate(Uri uri, RunningIsolate isolate)
+      : method = _methodNameFromUri(uri) {
+    params.addAll(uri.queryParameters);
+    params['isolateId'] = isolate.serviceId;
+  }
+
+  Uri toUri() {
+    return new Uri(path: method, queryParameters: params);
+  }
+
   dynamic toJson() {
     return {
       'path': path,