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

LayoutTests/fast/events/window-onerror-12-expected.txt

Index: LayoutTests/fast/events/window-onerror-12-expected.txt
diff --git a/LayoutTests/fast/events/window-onerror-12-expected.txt b/LayoutTests/fast/events/window-onerror-12-expected.txt
index 778be293069940dd4950792d10a60c3f894c3d59..5e1b7f25c62f7f6b0e7cf09682ad5dd4952a2031 100644
--- a/LayoutTests/fast/events/window-onerror-12-expected.txt
+++ b/LayoutTests/fast/events/window-onerror-12-expected.txt
@@ -7,11 +7,35 @@ On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE
 
 
 window.onerror: "Uncaught TypeError: Cannot call method 'mu' of null" at window-onerror-12.html (Line: 12, Column: 74)
+Stack Trace:
+TypeError: Cannot call method 'mu' of null
+    at HTMLButtonElement.onclick window-onerror-12.html:12:123
+    at window-onerror-12.html:33:24
+
 Returning 'true': the error should not be reported in the console as an unhandled exception.
+
+
+
 window.onerror: "Uncaught TypeError: Cannot call method 'mu' of null" at window-onerror-12.html (Line: 35, Column: 74)
+Stack Trace:
+TypeError: Cannot call method 'mu' of null
+    at HTMLButtonElement.onclick window-onerror-12.html:35:104
+    at window-onerror-12.html:33:24
+
 Returning 'true': the error should not be reported in the console as an unhandled exception.
+
+
+
 window.onerror: "Uncaught TypeError: Cannot call method 'mu' of null" at window-onerror-12.html (Line: 35, Column: 74)
+Stack Trace:
+TypeError: Cannot call method 'mu' of null
+    at HTMLButtonElement.onclick window-onerror-12.html:35:104
+    at window-onerror-12.html:33:24
+
 Returning 'true': the error should not be reported in the console as an unhandled exception.
+
+
+
 PASS successfullyParsed is true
 
 TEST COMPLETE