Add "step in recommended" to LiveEdit response object.

src/liveedit-debugger.js

 // Copyright 2010 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 141 matching lines @@
 
     // We haven't changed anything before this line yet.
     // Committing all changes.
 
     // Check that function being patched is not currently on stack or drop them.
     var dropped_functions_number =
         CheckStackActivations(replaced_function_infos, change_log);
 
     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);
 
     var old_script;
 
     // Create an old script only if there are function that should be linked
     // to old version.
     if (link_to_old_script_list.length == 0) {
       %LiveEditReplaceScript(script, new_source, null);
@@ skipping 902 matching lines @@
   }
 
 
   // Functions are public for tests.
   this.TestApi = {
     PosTranslator: PosTranslator,
     CompareStrings: CompareStrings,
     ApplySingleChunkPatch: ApplySingleChunkPatch
   };
 };