Use safer IPC serializations in media_param_traits.cc

content/common/media/audio_messages.h

 // Copyright (c) 2012 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.
 
 // IPC messages for the audio.
 // Multiply-included message file, hence no include guard.
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 13 matching lines @@
 
 IPC_ENUM_TRAITS_MAX_VALUE(media::AudioInputIPCDelegateState,
                           media::AUDIO_INPUT_IPC_DELEGATE_STATE_LAST)
 
 IPC_ENUM_TRAITS_MAX_VALUE(media::AudioOutputIPCDelegateState,
                           media::AUDIO_OUTPUT_IPC_DELEGATE_STATE_LAST)
 
 IPC_ENUM_TRAITS_MAX_VALUE(media::SwitchOutputDeviceResult,
                           media::SWITCH_OUTPUT_DEVICE_RESULT_LAST)
 
+IPC_ENUM_TRAITS_MAX_VALUE(media::AudioParameters::Format,
+                          media::AudioParameters::AUDIO_FORMAT_LAST)
+
+IPC_ENUM_TRAITS_MAX_VALUE(media::ChannelLayout, media::CHANNEL_LAYOUT_MAX)
+
 IPC_STRUCT_BEGIN(AudioInputHostMsg_CreateStream_Config)
   IPC_STRUCT_MEMBER(media::AudioParameters, params)
   IPC_STRUCT_MEMBER(bool, automatic_gain_control)
   IPC_STRUCT_MEMBER(uint32, shared_memory_count)
 IPC_STRUCT_END()
 
 // Messages sent from the browser to the renderer.
 
 // Tell the renderer process that an audio stream has been created.
 // The renderer process is given a shared memory handle for the audio data
@@ skipping 91 matching lines @@
                      int /* stream_id */,
                      double /* volume */)
 
 // Switch the output device of the stream specified by stream_id.
 IPC_MESSAGE_CONTROL5(AudioHostMsg_SwitchOutputDevice,
                      int /* stream_id */,
                      int /* render_frame_id */,
                      std::string /* device_id */,
                      GURL /* security_origin */,
                      int /* request_id */)