Return from |Configure()| asynchronously, and allow |InitBuffers()| to return errors.

content/renderer/pepper/pepper_media_stream_audio_track_host.h

 // Copyright 2014 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 CONTENT_RENDERER_PEPPER_PEPPER_MEDIA_STREAM_AUDIO_TRACK_HOST_H_
 #define CONTENT_RENDERER_PEPPER_PEPPER_MEDIA_STREAM_AUDIO_TRACK_HOST_H_
 
 #include <deque>
 
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "base/synchronization/lock.h"
 #include "base/threading/thread_checker.h"
 #include "content/public/renderer/media_stream_audio_sink.h"
 #include "content/renderer/pepper/pepper_media_stream_track_host_base.h"
 #include "media/audio/audio_parameters.h"
+#include "ppapi/host/host_message_context.h"
 #include "ppapi/shared_impl/media_stream_audio_track_shared.h"
 #include "third_party/WebKit/public/platform/WebMediaStreamTrack.h"
 
 namespace base {
 class MessageLoopProxy;
 }  // namespace base
 
 namespace content {
 
 class PepperMediaStreamAudioTrackHost : public PepperMediaStreamTrackHostBase {
@@ skipping 10 matching lines @@
    public:
     explicit AudioSink(PepperMediaStreamAudioTrackHost* host);
     virtual ~AudioSink();
 
     // Enqueues a free buffer index into |buffers_| which will be used for
     // sending audio samples to plugin.
     // This function is called on the main thread.
     void EnqueueBuffer(int32_t index);
 
     // This function is called on the main thread.
-    void Configure(int32_t number_of_buffers, int32_t duration);
+    int32_t Configure(int32_t number_of_buffers, int32_t duration,
+                      const ppapi::host::ReplyMessageContext& context);
+
+    // Send a reply to the currently pending |Configure()| request.
+    void SendConfigureReply(int32_t result);
 
    private:
     // Initializes buffers on the main thread.
     void SetFormatOnMainThread(int bytes_per_second, int bytes_per_frame);
 
     void InitBuffers();
 
     // Send enqueue buffer message on the main thread.
     void SendEnqueueBufferMessageOnMainThread(int32_t index,
                                               int32_t buffers_generation);
@@ skipping 71 matching lines @@
 
     // Number of bytes per second.
     int bytes_per_second_;
 
     // Number of bytes per frame = channels * bytes per sample.
     int bytes_per_frame_;
 
     // User-configured buffer duration, in milliseconds.
     int32_t user_buffer_duration_;
 
+    // Pending |Configure()| reply context.
+    ppapi::host::ReplyMessageContext pending_configure_reply_;
+
     DISALLOW_COPY_AND_ASSIGN(AudioSink);
   };
 
   virtual ~PepperMediaStreamAudioTrackHost();
 
   // ResourceMessageHandler overrides:
   virtual int32_t OnResourceMessageReceived(
       const IPC::Message& msg,
       ppapi::host::HostMessageContext* context) OVERRIDE;
 
@@ skipping 18 matching lines @@
   bool connected_;
 
   AudioSink audio_sink_;
 
   DISALLOW_COPY_AND_ASSIGN(PepperMediaStreamAudioTrackHost);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_PEPPER_PEPPER_MEDIA_STREAM_AUDIO_TRACK_HOST_H_