pkg/vm_service_client: add getSourceReport to VMServiceReference

test/isolate_test.dart

Index: test/isolate_test.dart
diff --git a/test/isolate_test.dart b/test/isolate_test.dart
index 8c354bb4bebf5c0932cd97ff7527bea3db9a9ed5..a62c2c913ec00c953c3dcc538e5dde0d7d06ad0e 100644
--- a/test/isolate_test.dart
+++ b/test/isolate_test.dart
@@ -376,7 +376,7 @@ void main() {
 
       isolate = (await client.getVM()).isolates.first;
       await isolate.waitUntilPaused();
-      stdout = new StreamQueue(lines.bind(isolate.stdout));
+      stdout = new StreamQueue(isolate.stdout.transform(lines));
     });
 
     test("resumes normal execution by default", () async {