Add PPB_VarArray_Dev support - part 1.

ppapi/shared_impl/array_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_ARRAY_VAR_H_
+#define PPAPI_SHARED_IMPL_ARRAY_VAR_H_
+
+#include <vector>
+
+#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 ArrayVar : public Var {
+ public:
+  typedef std::vector<ScopedPPVar> ElementVector;
+
+  ArrayVar();
+
+  // Helper function that converts a PP_Var to an ArrayVar. This will return
+  // NULL if the PP_Var is not of type PP_VARTYPE_ARRAY or the array cannot be
+  // found from the var tracker.
+  static ArrayVar* FromPPVar(const PP_Var& var);
+
+  // Var overrides.
+  virtual ArrayVar* AsArrayVar() OVERRIDE;
+  virtual PP_VarType GetType() const OVERRIDE;
+
+  // The returned PP_Var has had a ref added on behalf of the caller.
+  PP_Var Get(uint32_t index) const;
+  PP_Bool Set(uint32_t index, const PP_Var& value);
+  uint32_t GetLength() const;
+  PP_Bool SetLength(uint32_t length);
+
+  const ElementVector& elements() const {
+    return elements_;
+  }
+
+  ElementVector& elements() {
+    return elements_;
+  }
+
+ protected:
+  virtual ~ArrayVar();
+
+ private:
+  ElementVector elements_;
+
+  DISALLOW_COPY_AND_ASSIGN(ArrayVar);
+};
+
+}  // namespace ppapi
+
+#endif  // PPAPI_SHARED_IMPL_ARRAY_VAR_H_