Pepper: Add support for multicast in PPB_UDPSocket API

ppapi/api/ppb_udp_socket.idl

 /* Copyright 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_UDPSocket</code> interface.
  */
 
 label Chrome {
   M29 = 1.0,
-  M41 = 1.1
+  M41 = 1.1,
+  M42 = 1.2

[bbudge, 2015/02/13 00:03:16]

This should be 'dev' channel until we've reviewed the API to make sure we can
commit to supporting it.
i.e.
[channel=dev] M42 = 1.2

[etrunko, 2015/02/13 20:19:58]

Done.

 };
 
 /**
  * Option names used by <code>SetOption()</code>.
  */
 [assert_size(4)]
 enum PP_UDPSocket_Option {
   /**
    * Allows the socket to share the local address to which it will be bound with
    * other processes. Value's type should be <code>PP_VARTYPE_BOOL</code>.
@@ skipping 26 matching lines @@
    * Specifies the total per-socket buffer space reserved for receives. Value's
    * type should be <code>PP_VARTYPE_INT32</code>.
    * On version 1.0, this option can only be set after a successful
    * <code>Bind()</code> call. On version 1.1 or later, there is no such
    * limitation.
    *
    * Note: This is only treated as a hint for the browser to set the buffer
    * size. Even if <code>SetOption()</code> succeeds, the browser doesn't
    * guarantee it will conform to the size.
    */
-  PP_UDPSOCKET_OPTION_RECV_BUFFER_SIZE = 3
+  PP_UDPSOCKET_OPTION_RECV_BUFFER_SIZE = 3,
+
+  /**
+   * Specifies whether the packets sent from the host to the multicast group
+   * should be looped back to the host or not. Value's type should be
+   * <code>PP_VARTYPE_BOOL</code>.
+   * This option can only be set before calling <code>Bind()</code>.
+   *
+   * This is only supported in version 1.2 of the API (Chrome 42) and later.
+   */
+  PP_UDPSOCKET_OPTION_MULTICAST_LOOP = 4,
+
+  /**
+   * Specifies the time-to-live for packets sent to the multicast group. The
+   * value should be within 0 to 255 range. The default value is 1 and means
+   * that packets will not be routed beyond the local network. Value's type
+   * should be <code>PP_VARTYPE_INT32</code>.
+   * This option can only be set before calling <code>Bind()</code>.
+   *
+   * This is only supported in version 1.2 of the API (Chrome 42) and later.
+   */
+  PP_UDPSOCKET_OPTION_MULTICAST_TTL = 5
 };
 
 /**
  * The <code>PPB_UDPSocket</code> interface provides UDP socket operations.
  *
  * Permissions: Apps permission <code>socket</code> with subrule
  * <code>udp-bind</code> is required for <code>Bind()</code>; subrule
  * <code>udp-send-to</code> is required for <code>SendTo()</code>.
  * For more details about network communication permissions, please see:
  * http://developer.chrome.com/apps/app_network.html
@@ skipping 143 matching lines @@
    * @param[in] callback A <code>PP_CompletionCallback</code> to be called upon
    * completion.
    *
    * @return An int32_t containing an error code from <code>pp_errors.h</code>.
    */
   [version=1.1]
   int32_t SetOption([in] PP_Resource udp_socket,
                     [in] PP_UDPSocket_Option name,
                     [in] PP_Var value,
                     [in] PP_CompletionCallback callback);
+
+  /**
+   * Sets a socket option on the UDP socket.
+   * Please see the <code>PP_UDPSocket_Option</code> description for option
+   * names, value types and allowed values.
+   *
+   * @param[in] udp_socket A <code>PP_Resource</code> corresponding to a UDP
+   * socket.
+   * @param[in] name The option to set.
+   * @param[in] value The option value to set.
+   * @param[in] callback A <code>PP_CompletionCallback</code> to be called upon
+   * completion.
+   *
+   * @return An int32_t containing an error code from <code>pp_errors.h</code>.
+   */
+  [version=1.2]
+  int32_t SetOption([in] PP_Resource udp_socket,
+                    [in] PP_UDPSocket_Option name,
+                    [in] PP_Var value,
+                    [in] PP_CompletionCallback callback);
+
+  /**
+   * Joins the multicast group with address specified by <code>group</code>
+   * parameter, which is expected to be a <code>PPB_NetAddress</code> object.
+   *
+   * @param[in] udp_socket A <code>PP_Resource</code> corresponding to a UDP
+   * socket.
+   * @param[in] group A <code>PP_Resource</code> corresponding to the network
+   * address of the multicast group.
+   * @param[in] callback A <code>PP_CompletionCallback</code> to be called upon
+   * completion.
+   *
+   * @return An int32_t containing an error code from <code>pp_errors.h</code>.
+   */
+  [version=1.2]
+  int32_t JoinGroup([in] PP_Resource udp_socket,
+                    [in] PP_Resource group,
+                    [in] PP_CompletionCallback callback);
+
+  /**
+   * Leaves the multicast group with address specified by <code>group</code>
+   * parameter, which is expected to be a <code>PPB_NetAddress</code> object.
+   *
+   * @param[in] udp_socket A <code>PP_Resource</code> corresponding to a UDP
+   * socket.
+   * @param[in] group A <code>PP_Resource</code> corresponding to the network
+   * address of the multicast group.
+   * @param[in] callback A <code>PP_CompletionCallback</code> to be called upon
+   * completion.
+   *
+   * @return An int32_t containing an error code from <code>pp_errors.h</code>.
+   */
+  [version=1.2]
+  int32_t LeaveGroup([in] PP_Resource udp_socket,
+                     [in] PP_Resource group,
+                     [in] PP_CompletionCallback callback);
 };