Fix the isolate unit tests to create an isolate from a snapshot.

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 41 matching lines @@
 }
 
 
 //
 // Measure creation of core isolate from a snapshot.
 //
 BENCHMARK(CorelibIsolateStartup) {
   const int kNumIterations = 100;
   char* err = NULL;
   Dart_Isolate base_isolate = Dart_CurrentIsolate();
-  Dart_Isolate test_isolate = Dart_CreateIsolate(NULL, NULL, NULL, NULL, &err);
+  Dart_Isolate test_isolate = Dart_CreateIsolate(NULL, NULL,
+                                                 bin::snapshot_buffer,
+                                                 NULL, &err);
   EXPECT(test_isolate != NULL);
   Dart_EnterScope();
   uint8_t* buffer = NULL;
   intptr_t size = 0;
   Dart_Handle result = Dart_CreateSnapshot(&buffer, &size);
   EXPECT_VALID(result);
   Timer timer(true, "Core Isolate startup benchmark");
   timer.Start();
   for (int i = 0; i < kNumIterations; i++) {
     Dart_Isolate new_isolate =
@@ skipping 374 matching lines @@
 
   // 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());
 }
 
 }  // namespace dart