Factor dart_init.cc out of dart_controller.cc

sky/engine/core/script/dart_init.h

+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef SKY_ENGINE_CORE_SCRIPT_DART_INIT_H_
+#define SKY_ENGINE_CORE_SCRIPT_DART_INIT_H_
+
+#include "dart/runtime/include/dart_api.h"
+
+namespace blink {
+
+extern const uint8_t* kDartVmIsolateSnapshotBuffer;
+extern const uint8_t* kDartIsolateSnapshotBuffer;
+
+void InitDartVM();
+Dart_Handle DartLibraryTagHandler(Dart_LibraryTag tag,
+                                  Dart_Handle library,
+                                  Dart_Handle url);
+void EnsureHandleWatcherStarted();
+
+}
+
+#endif // SKY_ENGINE_CORE_SCRIPT_DART_INIT_H_