Add stack traces to mjsunit tests.

Review URL: http://codereview.chromium.org/2094005

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@4654 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

samples/shell.cc

@@ -299,5 +299,10 @@ void ReportException(v8::TryCatch* try_catch) {
       printf("^");
     }
     printf("\n");
+    v8::String::Utf8Value stack_trace(try_catch->StackTrace());
+    if (stack_trace.length() > 0) {
+      const char* stack_trace_string = ToCString(stack_trace);
+      printf("%s\n", stack_trace_string);
+    }
   }
 }

test/mjsunit/mjsunit.js

@@ -27,6 +27,8 @@
 
 function MjsUnitAssertionError(message) {
   this.message = message;
+  // This allows fetching the stack trace using TryCatch::StackTrace.
+  this.stack = new Error("").stack;
 }
 
 MjsUnitAssertionError.prototype.toString = function () {