Dart: Adds a program to create snapshots of Mojo apps.

mojo/dart/dart_snapshotter/vm.h

Index: mojo/dart/dart_snapshotter/vm.h
diff --git a/mojo/dart/dart_snapshotter/vm.h b/mojo/dart/dart_snapshotter/vm.h
new file mode 100644
index 0000000000000000000000000000000000000000..33ca79024c91a3f8524e1077b2337421eb8a2708
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+++ b/mojo/dart/dart_snapshotter/vm.h
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+// 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();
+void LoadScript(const std::string& url);
+
+#endif  // MOJO_DART_DART_SNAPSHOTTER_VM_H_