Added the ability to associate trace information with failing specs

This is meant to aid in debugging failures, particularly intermittent
failures, in cases where interactive debugging or console.log aren't
suitable.

lib/jasmine-core/jasmine-html.js

@@ -423,9 +423,53 @@ jasmineRequire.HtmlReporter = function(j$) {
         );
       }
 
+      if (result.trace) {
+        messages.appendChild(traceTable(result.trace));
+      }
+
       return failure;
     }
 
+    function traceTable(trace) {
+      var tbody = createDom('tbody');
+
+      trace.forEach(function(entry) {
+        tbody.appendChild(
+          createDom(
+            'tr',
+            {},
+            createDom('td', {}, entry.timestamp.toString()),
+            createDom('td', {}, entry.message)
+          )
+        );
+      });
+
+      return createDom(
+        'div',
+        { className: 'jasmine-trace' },
+        createDom(
+          'div',
+          { className: 'jasmine-trace-header' },
+          'Trace information'
+        ),
+        createDom(
+          'table',
+          {},
+          createDom(
+            'thead',
+            {},
+            createDom(
+              'tr',
+              {},
+              createDom('th', {}, 'Time (ms)'),
+              createDom('th', {}, 'Message')
+            )
+          ),
+          tbody
+        )
+      );
+    }
+
     function summaryList(resultsTree, domParent) {
       var specListNode;
       for (var i = 0; i < resultsTree.children.length; i++) {