Add a new bindings2/scripts directory for Dart bindings

sky/engine/bindings2/scripts/templates/callback_interface_h.template

+// Copyright 2014 The Dartium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// This file has been auto-generated by {{code_generator_dart}}. DO NOT MODIFY!
+
+#ifndef {{dart_class}}_h
+#define {{dart_class}}_h
+
+{% for filename in header_includes %}
+#include "{{filename}}"
+{% endfor %}
+
+#include "sky/engine/tonic/dart_converter.h"
+#include "sky/engine/tonic/dart_state.h"
+#include "sky/engine/wtf/PassOwnPtr.h"
+
+namespace blink {
+
+class {{dart_class}} : public {{cpp_class}} {
+ public:
+  typedef {{dart_class}} NativeType;
+
+  static PassOwnPtr<NativeType> create(Dart_Handle object,
+                                       Dart_Handle& exception) {
+    return adoptPtr(new {{dart_class}}(object, exception));
+  }
+
+  static PassOwnPtr<NativeType> createWithNullCheck(Dart_Handle object,
+                                                    Dart_Handle& exception) {
+    if (Dart_IsNull(object))
+      return PassOwnPtr<NativeType>();
+    return create(object, exception);
+  }
+
+  static PassOwnPtr<NativeType> create(Dart_NativeArguments args,
+                                       int index,
+                                       Dart_Handle& exception) {
+    Dart_Handle object = Dart_GetNativeArgument(args, index);
+    return create(object, exception);
+  }
+
+  static PassOwnPtr<NativeType> createWithNullCheck(Dart_NativeArguments args,
+                                                    int index,
+                                                    Dart_Handle& exception) {
+    Dart_Handle object = Dart_GetNativeArgument(args, index);
+    if (Dart_IsNull(object))
+      return PassOwnPtr<NativeType>();
+    return create(object, exception);
+  }
+
+{% for method in methods %}
+  virtual {{method.cpp_type}} {{method.name}}({{method.argument_declarations | join(', ')}}) override;
+{% endfor %}
+ private:
+  {{dart_class}}(Dart_Handle object, Dart_Handle& exception)
+      : callback_(DartState::Current(), object, exception) {
+  }
+
+  DartCallback callback_;
+};
+
+template <>
+struct DartConverter<{{ cpp_class }}*> {
+  static PassOwnPtr<{{dart_class}}> FromArguments(
+      Dart_NativeArguments args, int index, Dart_Handle& exception) {
+    return {{dart_class}}::create(args, index, exception);
+  }
+
+  static PassOwnPtr<{{dart_class}}> FromArgumentsWithNullCheck(
+      Dart_NativeArguments args, int index, Dart_Handle& exception) {
+    return {{dart_class}}::createWithNullCheck(args, index, exception);
+  }
+};
+
+}  // blink
+#endif // {{dart_class}}_h