Enables clean VM shutdown.

runtime/vm/metrics_test.cc

 // Copyright (c) 2014, 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 "platform/assert.h"
 
 #include "vm/dart_api_impl.h"
 #include "vm/dart_api_state.h"
 #include "vm/globals.h"
 #include "vm/json_stream.h"
@@ skipping 10 matching lines @@
   EXPECT_EQ(isolate, Isolate::Current());
   Metric metric;
 
   // Initialize metric.
   metric.Init(Isolate::Current(), "a.b.c", "foobar", Metric::kCounter);
   EXPECT_EQ(0, metric.value());
   metric.increment();
   EXPECT_EQ(1, metric.value());
   metric.set_value(44);
   EXPECT_EQ(44, metric.value());
+
+  Dart::ShutdownIsolate();
 }
 
 class MyMetric : public Metric {
  protected:
   int64_t Value() const {
     // 99 bytes.
     return 99;
   }
 
  public:
@@ skipping 16 matching lines @@
   EXPECT_EQ(99, metric.LeakyValue());
 
   // Serialize to JSON.
   JSONStream js;
   metric.PrintJSON(&js);
   const char* json = js.ToCString();
   EXPECT_STREQ("{\"type\":\"Counter\",\"name\":\"a.b.c\",\"description\":"
                "\"foobar\",\"unit\":\"byte\","
                "\"fixedId\":true,\"id\":\"metrics\\/native\\/a.b.c\""
                ",\"value\":99.000000}", json);
+
+  Dart::ShutdownIsolate();
 }
 
 }  // namespace dart