Save actual break point location to script break point object.

test/mjsunit/debug-setbreakpoint.js

Index: test/mjsunit/debug-setbreakpoint.js
===================================================================
--- test/mjsunit/debug-setbreakpoint.js	(revision 4865)
+++ test/mjsunit/debug-setbreakpoint.js	(working copy)
@@ -134,6 +134,7 @@
 };
 
 function g() {
+  // Comment.
   f();
 };
 
@@ -184,3 +185,8 @@
 sourceUrlFunc();
 
 assertTrue(breakListenerCalled, "Break listener not called on breakpoint set by sourceURL");
+
+// Set a break point on a line with the comment, and check that actual position
+// is the next line after the comment.
+var number = Debug.setScriptBreakPointById(g_script_id, g_line + 1);
+assertEquals(g_line + 2, Debug.findBreakPoint(number).actual_location.line);