Dart: Reorganize files

mojo/dart/dart_snapshotter/vm.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 MOJO_DART_DART_SNAPSHOTTER_VM_H_
-#define MOJO_DART_DART_SNAPSHOTTER_VM_H_
-
-#include "dart/runtime/include/dart_api.h"
-#include "tonic/dart_library_provider.h"
-#include "tonic/dart_state.h"
-
-class SnapshotterDartState : public tonic::DartState {
- public:
-  SnapshotterDartState() : library_provider_(nullptr) {
-  };
-
-  tonic::DartLibraryProvider* library_provider() const {
-    return library_provider_.get();
-  }
-
-  void set_library_provider(tonic::DartLibraryProvider* library_provider) {
-    library_provider_.reset(library_provider);
-    DCHECK(library_provider_.get() == library_provider);
-  }
-
-  static SnapshotterDartState* From(Dart_Isolate isolate) {
-    return reinterpret_cast<SnapshotterDartState*>(DartState::From(isolate));
-  }
-
-  static SnapshotterDartState* Current() {
-    return reinterpret_cast<SnapshotterDartState*>(DartState::Current());
-  }
-
-  static SnapshotterDartState* Cast(void* data) {
-    return reinterpret_cast<SnapshotterDartState*>(data);
-  }
-
- private:
-  std::unique_ptr<tonic::DartLibraryProvider> library_provider_;
-};
-
-void InitDartVM();
-Dart_Isolate CreateDartIsolate();
-
-#endif  // MOJO_DART_DART_SNAPSHOTTER_VM_H_