Import Dart bindings as of Blink r188698. This merely copies the files over and does not attach any…

sky/engine/bindings-dart/core/dart/DartService.h

Index: sky/engine/bindings-dart/core/dart/DartService.h
diff --git a/sky/engine/bindings-dart/core/dart/DartService.h b/sky/engine/bindings-dart/core/dart/DartService.h
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+++ b/sky/engine/bindings-dart/core/dart/DartService.h
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+// Copyright (c) 2013, 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.
+
+#ifndef DartService_h
+#define DartService_h
+
+#include "wtf/text/WTFString.h"
+
+#include <dart_api.h>
+#include <dart_native_api.h>
+
+namespace blink {
+
+class Document;
+
+class DartServiceRequest {
+public:
+    DartServiceRequest(const String& request);
+    virtual ~DartServiceRequest();
+
+    // Override this method and it will be called when
+    // the response has been received from the VM service.
+    virtual void ResponseReady(const char* response) = 0;
+
+    const String& GetRequestString() { return m_request; };
+private:
+    String m_request;
+};
+
+class DartService {
+public:
+    // Returns false if service could not be started.
+    static bool Start(Document*);
+    // Error message if startup failed.
+    static const char* GetErrorMessage();
+    static void MakeServiceRequest(DartServiceRequest*);
+    static bool IsRunning() { return m_isolate; }
+
+private:
+    static Dart_Handle LoadScript();
+    static Dart_NativeFunction NativeResolver(Dart_Handle name, int numArguments, bool* autoScopeSetup);
+    static Dart_Isolate m_isolate;
+    static const char* m_errorMsg;
+    friend class DartServiceInternal;
+};
+
+}
+
+#endif // DartService_h