Add an examples getter for all Message objects in Intl

pkg/intl/lib/src/intl_message.dart

Index: pkg/intl/lib/src/intl_message.dart
diff --git a/pkg/intl/lib/src/intl_message.dart b/pkg/intl/lib/src/intl_message.dart
index 13aad6248562b233564c31adb0dabd00b05b121f..e83213794a700a22cd82c3f15ac85b6368e08a07 100644
--- a/pkg/intl/lib/src/intl_message.dart
+++ b/pkg/intl/lib/src/intl_message.dart
@@ -57,10 +57,18 @@ abstract class Message {
 
   /**
    * We find the arguments from the top-level [MainMessage] and use those to
-   * do variable substitutions.
+   * do variable substitutions. [MainMessage] overrides this to return
+   * the actual arguments.
    */
   get arguments => parent == null ? const [] : parent.arguments;
 
+  /**
+   * We find the examples from the top-level [MainMessage] and use those
+   * when writing out variables. [MainMessage] overrides this to return
+   * the actual examples.
+   */
+  get examples => parent == null ? const [] : parent.examples;
+
   String checkValidity(MethodInvocation node, List arguments,
                        String outerName, FormalParameterList outerArgs) {
     var hasArgs = arguments.any(