Add an (unimplemented) API for getting the available list of font families on

ppapi/c/dev/ppb_font_list_dev.h

+/* Copyright (c) 2011 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_C_DEV_PPB_FONT_LIST_DEV_H_
+#define PPAPI_C_DEV_PPB_FONT_LIST_DEV_H_
+
+#include "ppapi/c/pp_completion_callback.h"
+#include "ppapi/c/pp_instance.h"
+#include "ppapi/c/pp_resource.h"
+#include "ppapi/c/pp_var.h"
+
+#define PPB_FONT_LIST_DEV_INTERFACE "PPB_FontList(Dev);0.1"
+
+struct PPB_FontList_Dev {
+  /* Creates a font list resource. By default, the list will be empty, you must
+   * call Initialize before calling any other functions to actually populate
+   * the fonts.
+   */
+  PP_Resource (*Create)(PP_Instance instance);
+
+  /* Actually retrieves the fonts associated with this resource. This function
+   * will complete asynchronously (it may be slow to get all of the fonts from
+   * the operating system).
+   */
+  int32_t (*Initialize)(PP_Resource font_list,
+                        struct PP_CompletionCallback completion);
+
+  /* Returns the number of entries in the font list. If you call on an invalid
+   * resource or a FontList that has not issued its create completion callback
+   * yet, it will return 0.
+   */
+  int32_t (*GetListSize)(PP_Resource font_list);
+
+  /* Retrieves the font family name at the given index, returning it in a
+   * string var. Valid indices are [0, GetListSize). Passing an invalid
+   * resource, an out-of-range index, or a FontList that has not issued its
+   * create completion callback from Initialize() yet will result in a Null var
+   * being returned.
+   */
+  struct PP_Var (*GetFontFaceAt)(PP_Resource font_list, int32_t index);
+};
+
+#endif  /* PPAPI_C_DEV_PPB_FONT_LIST_DEV_H_ */
+