Add a VM benchmark for creating the local MirrorSystem.

runtime/vm/benchmark_test.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/benchmark_test.h"
 
 #include "bin/builtin.h"
 #include "bin/file.h"
 
 #include "platform/assert.h"
@@ skipping 437 matching lines @@
   Api::CheckIsolateState(Isolate::Current());
 
   // Write snapshot with object content.
   FullSnapshotWriter writer(&buffer, &malloc_allocator);
   writer.WriteFullSnapshot();
   const Snapshot* snapshot = Snapshot::SetupFromBuffer(buffer);
   ASSERT(snapshot->kind() == Snapshot::kFull);
   benchmark->set_score(snapshot->length());
 }
 
+
+BENCHMARK(CreateMirrorSystem) {
+  const char* kScriptChars =
+      "import 'dart:mirrors';\n"
+      "\n"
+      "void benchmark() {\n"
+      "  currentMirrorSystem();\n"
+      "}\n";
+
+  Dart_Handle lib = TestCase::LoadTestScript(kScriptChars, NULL);
+  Dart_Handle args[0];
+
+  Timer timer(true, "currentMirrorSystem() benchmark");
+  timer.Start();
+  Dart_Invoke(lib, NewString("benchmark"), 0, args);
+  timer.Stop();
+  int64_t elapsed_time = timer.TotalElapsedTime();
+  benchmark->set_score(elapsed_time);
+}
+
 }  // namespace dart