Add PPB_VarDictionary_Dev support - part 1.

ppapi/shared_impl/dictionary_var.h

+// Copyright (c) 2013 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 PPAPI_SHARED_IMPL_DICTIONARY_VAR_H_
+#define PPAPI_SHARED_IMPL_DICTIONARY_VAR_H_
+
+#include <map>
+#include <string>
+
+#include "base/basictypes.h"
+#include "base/compiler_specific.h"
+#include "ppapi/c/pp_var.h"
+#include "ppapi/shared_impl/ppapi_shared_export.h"
+#include "ppapi/shared_impl/scoped_pp_var.h"
+#include "ppapi/shared_impl/var.h"
+
+namespace ppapi {
+
+class PPAPI_SHARED_EXPORT DictionaryVar : public Var {
+ public:
+  typedef std::map<std::string, ScopedPPVar> KeyValueMap;
+
+  DictionaryVar();
+
+  // Helper function that converts a PP_Var to a DictionaryVar. This will
+  // return NULL if the PP_Var is not of type PP_VARTYPE_DICTIONARY or the
+  // dictionary cannot be found from the var tracker.
+  static DictionaryVar* FromPPVar(const PP_Var& var);
+
+  // Var overrides.
+  virtual DictionaryVar* AsDictionaryVar() OVERRIDE;
+  virtual PP_VarType GetType() const OVERRIDE;
+
+  // The returned PP_Var has had a ref added on behalf of the caller.
+  PP_Var Get(const PP_Var& key) const;
+  PP_Bool Set(const PP_Var& key, const PP_Var& value);
+  void Delete(const PP_Var& key);
+  PP_Bool HasKey(const PP_Var& key) const;
+  // The returned PP_Var has had a ref added on behalf of the caller.
+  PP_Var GetKeys() const;
+
+  // Returns false and keeps the dictionary unchanged if |key| is not a valid
+  // UTF-8 string.
+  bool SetWithStringKey(const std::string& utf8_key, const PP_Var& value);
+  void DeleteWithStringKey(const std::string& utf8_key);
+
+  const KeyValueMap& key_value_map() const {
+    return key_value_map_;
+  }
+
+ protected:
+  virtual ~DictionaryVar();
+
+ private:
+  KeyValueMap key_value_map_;
+
+  DISALLOW_COPY_AND_ASSIGN(DictionaryVar);
+};
+
+}  // namespace ppapi
+
+#endif  // PPAPI_SHARED_IMPL_DICTIONARY_VAR_H_