Change times reported from io resource meta data to be milliseconds since epoch

runtime/observatory/tests/service/file_service_test.dart

Index: runtime/observatory/tests/service/file_service_test.dart
diff --git a/runtime/observatory/tests/service/file_service_test.dart b/runtime/observatory/tests/service/file_service_test.dart
index dbb8e530e7b73e3d719d6d051fc2531f7974f938..47611b1841e5bf5380d7ead1d80e6ae99b84e2c2 100644
--- a/runtime/observatory/tests/service/file_service_test.dart
+++ b/runtime/observatory/tests/service/file_service_test.dart
@@ -83,15 +83,19 @@ var fileTests = [
       expect(writing['read_count'], equals(0));
       expect(writing['write_count'], equals(3));
       expect(writing['total_written'], equals(3));
+      expect(writing['last_write'], greaterThan(0));
+      expect(writing['last_read'], equals(0));
 
       var reading = await isolate.invokeRpcNoUpgrade(
-           '__getFileByID', { 'id' : result['data'][1]['id'] });
-
+          '__getFileByID', { 'id' : result['data'][1]['id'] });
 
       expect(reading['total_read'], equals(5));
       expect(reading['read_count'], equals(5));
       expect(reading['write_count'], equals(0));
       expect(reading['total_written'], equals(0));
+      expect(reading['last_write'], equals(0));
+      expect(reading['last_read'], greaterThan(0));
+
     } finally {
       await isolate.invokeRpcNoUpgrade('__cleanup', {});
     }