Add "step in recommended" to LiveEdit response object.

src/liveedit-debugger.js

Index: src/liveedit-debugger.js
diff --git a/src/liveedit-debugger.js b/src/liveedit-debugger.js
index abfb0f69c61bd7a9dadbe45cd2cfb6749b358fdf..4463c93e2a071acafc2b0ff482d25ceb53f57abb 100644
--- a/src/liveedit-debugger.js
+++ b/src/liveedit-debugger.js
@@ -159,6 +159,11 @@ Debug.LiveEdit = new function() {
 
     preview_description.stack_modified = dropped_functions_number != 0;
 
+    // Our current implementation requires client to manually issue "step in"
+    // command for correct stack state.
+    preview_description.stack_update_needs_step_in =
+        preview_description.stack_modified;
+
     // Start with breakpoints. Convert their line/column positions and
     // temporary remove.
     var break_points_restorer = TemporaryRemoveBreakPoints(script, change_log);