Import wpt@c5a14f553cba5f197743b9af605a84eddd8692a2

third_party/WebKit/LayoutTests/resources/testharness.js

Index: third_party/WebKit/LayoutTests/resources/testharness.js
diff --git a/third_party/WebKit/LayoutTests/resources/testharness.js b/third_party/WebKit/LayoutTests/resources/testharness.js
index 5b924b10948fd885e6941cb3d76a18b4cc16c1a7..69ffe013ce5b50d1aaab8cb83d6dabadac7e1be6 100644
--- a/third_party/WebKit/LayoutTests/resources/testharness.js
+++ b/third_party/WebKit/LayoutTests/resources/testharness.js
@@ -1247,6 +1247,7 @@ policies and contribution forms [3].
                 ReadOnlyError: 0,
                 VersionError: 0,
                 OperationError: 0,
+                NotAllowedError: 0
             };
 
             if (!(name in name_code_map)) {
@@ -2463,6 +2464,11 @@ policies and contribution forms [3].
             }
         }
 
+        // 'Error.stack' is not supported in all browsers/versions
+        if (!stack) {
+            return "(Stack trace unavailable)";
+        }
+
         var lines = stack.split("\n");
 
         // Create a pattern to match stack frames originating within testharness.js.  These include the