Revert of Removed support deprecated (//@|/*@) source(URL|MappingURL)=

test/cctest/test-api.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 15303 matching lines @@
     "\n"
     "  bar();\n"
     "}\n"
     "foo();\n"
     "}\n"
     "eval('(' + outer +')()%s');";
 
   i::ScopedVector<char> code(1024);
   i::SNPrintF(code, source, "//# sourceURL=eval_url");
   CHECK(CompileRun(code.start())->IsUndefined());
+  i::SNPrintF(code, source, "//@ sourceURL=eval_url");
+  CHECK(CompileRun(code.start())->IsUndefined());
 }
 
 
 static int scriptIdInStack[2];
 
 void AnalyzeScriptIdInStack(
     const v8::FunctionCallbackInfo<v8::Value>& args) {
   v8::HandleScope scope(args.GetIsolate());
   v8::Handle<v8::StackTrace> stackTrace = v8::StackTrace::CurrentStackTrace(
       args.GetIsolate(), 10, v8::StackTrace::kScriptId);
@@ skipping 61 matching lines @@
     "\n"
     "  bar();\n"
     "}\n"
     "foo();\n"
     "}\n"
     "outer()\n%s";
 
   i::ScopedVector<char> code(1024);
   i::SNPrintF(code, source, "//# sourceURL=source_url");
   CHECK(CompileRunWithOrigin(code.start(), "url", 0, 1)->IsUndefined());
+  i::SNPrintF(code, source, "//@ sourceURL=source_url");
+  CHECK(CompileRunWithOrigin(code.start(), "url", 0, 1)->IsUndefined());
 }
 
 
 void AnalyzeStackOfDynamicScriptWithSourceURL(
     const v8::FunctionCallbackInfo<v8::Value>& args) {
   v8::HandleScope scope(args.GetIsolate());
   v8::Handle<v8::StackTrace> stackTrace = v8::StackTrace::CurrentStackTrace(
       args.GetIsolate(), 10, v8::StackTrace::kDetailed);
   CHECK_EQ(4, stackTrace->GetFrameCount());
   v8::Handle<v8::String> url = v8_str("source_url");
@@ skipping 24 matching lines @@
     "\n"
     "  bar();\n"
     "}\n"
     "foo();\n"
     "}\n"
     "outer()\n%s";
 
   i::ScopedVector<char> code(1024);
   i::SNPrintF(code, source, "//# sourceURL=source_url");
   CHECK(CompileRunWithOrigin(code.start(), "url", 0, 0)->IsUndefined());
+  i::SNPrintF(code, source, "//@ sourceURL=source_url");
+  CHECK(CompileRunWithOrigin(code.start(), "url", 0, 0)->IsUndefined());
 }
 
 
 TEST(DynamicWithSourceURLInStackTraceString) {
   LocalContext context;
   v8::HandleScope scope(context->GetIsolate());
 
   const char *source =
     "function outer() {\n"
     "  function foo() {\n"
@@ skipping 6760 matching lines @@
     env2->Global()->Set(v8_str("obj2"), object2);
     ExpectString("typeof obj2.values", "function");
     CHECK_NE(*object->Get(v8_str("values")), *object2->Get(v8_str("values")));
 
     auto values2 = Local<Function>::Cast(object2->Get(v8_str("values")));
     auto fn2 = i::Handle<i::JSFunction>::cast(v8::Utils::OpenHandle(*values2));
     auto ctx2 = v8::Utils::OpenHandle(*env2.local());
     CHECK_EQ(fn2->GetCreationContext(), *ctx2);
   }
 }