Add 'error' parameter to 'window.onerror' handlers.

LayoutTests/fast/events/window-onerror-03-expected.txt

Index: LayoutTests/fast/events/window-onerror-03-expected.txt
diff --git a/LayoutTests/fast/events/window-onerror-03-expected.txt b/LayoutTests/fast/events/window-onerror-03-expected.txt
index 97984ff257e5a07e9b1fde5fb467e7ead7528b79..01425d0608a10170d715d31eb193ab0bc32b4018 100644
--- a/LayoutTests/fast/events/window-onerror-03-expected.txt
+++ b/LayoutTests/fast/events/window-onerror-03-expected.txt
@@ -4,6 +4,14 @@ On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE
 
 
 window.onerror: "Uncaught ReferenceError: Invalid left-hand side in assignment" at window-onerror-03.html (Line: 1, Column: 0)
+ReferenceError: Invalid left-hand side in assignment
+    at eval (eval at  (file:///Volumes/Repositories/blink/src/third_party/WebKit/LayoutTests/fast/events/window-onerror-03.html:14:9), :1:1)
+    at file:///Volumes/Repositories/blink/src/third_party/WebKit/LayoutTests/fast/events/window-onerror-03.html:14:9
+
+ReferenceError: Invalid left-hand side in assignment
+    at eval window-onerror-03.html:14:9), :1:1
+    at window-onerror-03.html:14:9
+
 Returning 'true': the error should not be reported in the console as an unhandled exception.
 PASS successfullyParsed is true