Add PPB_VarArray_Dev support - part 1.

ppapi/api/dev/ppb_var_array_dev.idl

+/* 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.
+ */
+
+/**
+ * This file defines the <code>PPB_VarArray_Dev</code> struct providing
+ * a way to interact with array vars.
+ */
+
+label Chrome {
+  M27 = 0.1
+};
+
+[macro="PPB_VAR_ARRAY_DEV_INTERFACE"]
+interface PPB_VarArray_Dev {
+  /**
+   * Creates an array var, i.e., a <code>PP_Var</code> with type set to
+   * <code>PP_VARTYPE_ARRAY</code>. The array length is set to 0.
+   *
+   * @return An empty array var, whose reference count is set to 1 on behalf of
+   * the caller.
+   */
+  PP_Var Create();
+
+  /**
+   * Gets an element from the array.
+   *
+   * @param[in] array An array var.
+   * @param[in] index An index indicating which element to return.
+   *
+   * @return The element at the specified position. The reference count is
+   * incremented on behalf of the caller. If <code>index</code> is larger than
+   * or equal to the array length, an undefined var is returned.
+   */
+  PP_Var Get([in] PP_Var array, [in] uint32_t index);
+
+  /**
+   * Sets the value of an element in the array.
+   *
+   * @param[in] array An array var.
+   * @param[in] index An index indicating which element to modify. If
+   * <code>index</code> is larger than or equal to the array length, the length
+   * is updated to be <code>index</code> + 1. Any position in the array that
+   * hasn't been set before is set to undefined, i.e., <code>PP_Var</code> of
+   * type <code>PP_VARTYPE_UNDEFINED</code>.
+   * @param[in] value The value to set. The array holds a reference to it on
+   * success.
+   *
+   * @return A <code>PP_Bool</code> indicating whether the operation succeeds.
+   */
+  PP_Bool Set([in] PP_Var array, [in] uint32_t index, [in] PP_Var value);
+
+  /**
+   * Gets the array length.
+   *
+   * @param[in] array An array var.
+   *
+   * @return The array length.
+   */
+  uint32_t GetLength([in] PP_Var array);
+
+  /**
+   * Sets the array length.
+   *
+   * @param[in] array An array var.
+   * @param[in] length The new array length. If <code>length</code> is smaller
+   * than its current value, the array is truncated to the new length; any
+   * elements that no longer fit are removed. If <code>length</code> is larger
+   * than its current value, undefined vars are appended to increase the array
+   * to the specified length.
+   *
+   * @return A <code>PP_Bool</code> indicating whether the operation succeeds.
+   */
+  PP_Bool SetLength([in] PP_Var array, [in] uint32_t length);
+};