Add properties fileName and lineNumber to the Error object.

src/messages.js

Index: src/messages.js
diff --git a/src/messages.js b/src/messages.js
index 5310938a6612f75bdd6044b3715d48f879ad2273..d46f1dc427b2db7ef652d3ffb6c69ccfb4077ff9 100644
--- a/src/messages.js
+++ b/src/messages.js
@@ -1071,6 +1071,18 @@ function FormatRawStackTrace(error, raw_stack) {
   }
 }
 
+function GetTopFrame(raw_stack) {
+  for (var i = 0; i < raw_stack.length; i += 4) {
+    var recv = raw_stack[i];
+    var fun = raw_stack[i + 1];
+    var code = raw_stack[i + 2];
+    var pc = raw_stack[i + 3];
+    var pos = %FunctionGetPositionForOffset(code, pc);
+    var top_frame = new CallSite(recv, fun, pos);
+    if (!top_frame.isNative()) return top_frame;
+  }
+  return undefined;
+}
 
 function captureStackTrace(obj, cons_opt) {
   var stackTraceLimit = $Error.stackTraceLimit;
@@ -1084,6 +1096,17 @@ function captureStackTrace(obj, cons_opt) {
   DefineOneShotAccessor(obj, 'stack', function (obj) {
     return FormatRawStackTrace(obj, raw_stack);
   });
+
+  DefineOneShotAccessor(obj, 'lineNumber', function (obj) {
+    var frame = GetTopFrame(raw_stack);
+    return frame ? frame.getLineNumber() : undefined;
+  });
+  DefineOneShotAccessor(obj, 'fileName', function (obj) {
+    var frame = GetTopFrame(raw_stack);
+    return frame ? (frame.isEval() ? frame.getEvalOrigin()
+                                   : frame.getFileName())
+                 : undefined;
+  });
 }