Apps V2 in Pepper: introduce singleton resource ExtensionsCommon.

ppapi/api/extensions/dev/ppb_events_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.
- */
-
-label Chrome {
-  M27 = 0.1
-};
-
-/**
- * Used to represent arbitrary C function pointers. Please note that usually
- * the function that a <code>PP_Ext_GenericFuncType</code> pointer points to
- * has a different signature than <code>void (*)()</code>.
- */
-typedef void PP_Ext_GenericFuncType();
-
-/**
- * An event listener that can be registered with the browser and receive
- * notifications via the callback function.
- *
- * A function is defined for each event type to return a properly-filled
- * <code>PP_Ext_EventListener</code> struct, for example,
- * <code>PP_Ext_Alarms_OnAlarm_Dev()</code>.
- */
-[passByValue]
-struct PP_Ext_EventListener {
-  /**
-   * The name of the event to register to.
-   */
-  cstr_t event_name;
-  /**
-   * A callback function whose signature is determined by
-   * <code>event_name</code>. All calls will happen on the same thread as the
-   * one on which <code>AddListener()</code> is called.
-   */
-  PP_Ext_GenericFuncType func;
-  /**
-   * An opaque pointer that will be passed to <code>func</code>.
-   */
-  mem_t user_data;
-};
-
-interface PPB_Ext_Events_Dev {
-  /**
-   * Registers a listener to an event.
-   *
-   * @param[in] instance A <code>PP_Instance</code> identifying one instance of
-   * a module.
-   * @param[in] listener A <code>PP_Ext_EventListener</code> struct.
-   *
-   * @return An listener ID, or 0 if failed.
-   */
-  uint32_t AddListener(
-      [in] PP_Instance instance,
-      [in] PP_Ext_EventListener listener);
-
-  /**
-   * Deregisters a listener.
-   *
-   * @param[in] instance A <code>PP_Instance</code> identifying one instance of
-   * a module.
-   * @param[in] listener_id The ID returned by <code>AddListener()</code>.
-   */
-  void RemoveListener(
-      [in] PP_Instance instance,
-      [in] uint32_t listener_id);
-};
-
-#inline c
-/**
- * Creates a <code>PP_Ext_EventListener</code> struct.
- *
- * Usually you should not call it directly. Instead you should call those
- * functions that return a <code>PP_Ext_EventListener</code> struct for a
- * specific event type, for example, <code>PP_Ext_Alarms_OnAlarm_Dev()</code>.
- */
-PP_INLINE struct PP_Ext_EventListener PP_Ext_MakeEventListener(
-    const char* event_name,
-    PP_Ext_GenericFuncType func,
-    void* user_data) {
-  struct PP_Ext_EventListener listener;
-  listener.event_name = event_name;
-  listener.func = func;
-  listener.user_data = user_data;
-  return listener;
-}
-#endinl