Support 'restart call frame' debug command

src/liveedit-debugger.js

Index: src/liveedit-debugger.js
diff --git a/src/liveedit-debugger.js b/src/liveedit-debugger.js
index 4463c93e2a071acafc2b0ff482d25ceb53f57abb..39145b4935214eba90c4a4abf7e400982cd690cf 100644
--- a/src/liveedit-debugger.js
+++ b/src/liveedit-debugger.js
@@ -47,6 +47,8 @@ Debug.LiveEdit = new function() {
   // Forward declaration for minifier.
   var FunctionStatus;
 
+  var NEEDS_STEP_IN_PROPERTY_NAME = "stack_update_needs_step_in";
+
   // Applies the change to the script.
   // The change is in form of list of chunks encoded in a single array as
   // a series of triplets (pos1_start, pos1_end, pos2_end)
@@ -161,7 +163,7 @@ Debug.LiveEdit = new function() {
 
     // Our current implementation requires client to manually issue "step in"
     // command for correct stack state.
-    preview_description.stack_update_needs_step_in =
+    preview_description[NEEDS_STEP_IN_PROPERTY_NAME] =
         preview_description.stack_modified;
 
     // Start with breakpoints. Convert their line/column positions and
@@ -1078,6 +1080,18 @@ Debug.LiveEdit = new function() {
     return ProcessOldNode(old_code_tree);
   }
 
+  // Restarts call frame and returns value similar to what LiveEdit returns.
+  function RestartFrame(frame_mirror) {
+    var result = frame_mirror.restart();
+    if (IS_STRING(result)) {
+      throw new Failure("Failed to restart frame: " + result);
+    }
+    var result = {};
+    result[NEEDS_STEP_IN_PROPERTY_NAME] = true;
+    return result;
+  }
+  // Function is public.
+  this.RestartFrame = RestartFrame;
 
   // Functions are public for tests.
   this.TestApi = {