Added initial muted state to stream creation callback, to avoid races.

content/common/media/audio_messages.h

Index: content/common/media/audio_messages.h
diff --git a/content/common/media/audio_messages.h b/content/common/media/audio_messages.h
index 1fed2874859ad47b4607164e94ff5896d2ff993e..f9186608d511cbfc50eeb96fe34fcfa1cdc242c4 100644
--- a/content/common/media/audio_messages.h
+++ b/content/common/media/audio_messages.h
@@ -54,15 +54,16 @@ IPC_MESSAGE_CONTROL4(
     uint32_t /* length */)
 
 // Tell the renderer process that an audio input stream has been created.
-// The renderer process would be given a SyncSocket that it should read
-// from from then on. It is also given number of segments in shared memory.
-IPC_MESSAGE_CONTROL5(
-    AudioInputMsg_NotifyStreamCreated,
-    int /* stream id */,
-    base::SharedMemoryHandle /* handle */,
-    base::SyncSocket::TransitDescriptor /* socket descriptor */,
-    uint32_t /* length */,
-    uint32_t /* segment count */)
+// The renderer process would be given a SyncSocket that it should read from
+// from then on. It is also given number of segments in shared memory and
+// whether the stream initially is muted.
+IPC_MESSAGE_CONTROL(AudioInputMsg_NotifyStreamCreated,
+                    int /* stream id */,
+                    base::SharedMemoryHandle /* handle */,
+                    base::SyncSocket::TransitDescriptor /* socket descriptor */,
+                    uint32_t /* length */,
+                    uint32_t /* segment count */,
+                    bool /* initially muted */)
 
 // Notification message sent from AudioRendererHost to renderer for state
 // update on error.