When attempting to navigate to a page for an isolate that doesn't exist, offer to

runtime/observatory/observatory_sources.gypi

Index: runtime/observatory/observatory_sources.gypi
diff --git a/runtime/observatory/observatory_sources.gypi b/runtime/observatory/observatory_sources.gypi
index fadca29158e6abfe1a6d542794fac11fd022d772..5a52a051f3c6f5167feb5b33a1326987b1721cbd 100644
--- a/runtime/observatory/observatory_sources.gypi
+++ b/runtime/observatory/observatory_sources.gypi
@@ -83,6 +83,8 @@
     'lib/src/elements/instance_view.html',
     'lib/src/elements/io_view.dart',
     'lib/src/elements/io_view.html',
+    'lib/src/elements/isolate_reconnect.dart',
+    'lib/src/elements/isolate_reconnect.html',
     'lib/src/elements/isolate_ref.dart',
     'lib/src/elements/isolate_ref.html',
     'lib/src/elements/isolate_summary.dart',
@@ -140,4 +142,4 @@
     'web/main.dart',
     'web/favicon.ico',
   ],
-}
+}