Allow media track switching.

media/base/fake_audio_renderer_sink.cc

 // 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.
 
 #include "media/base/fake_audio_renderer_sink.h"
 
 #include "base/bind.h"
 #include "base/location.h"
 #include "base/logging.h"
 
@@ skipping 14 matching lines @@
       output_device_info_(std::string(),
                           OUTPUT_DEVICE_STATUS_OK,
                           hardware_params) {}
 
 FakeAudioRendererSink::~FakeAudioRendererSink() {
   DCHECK(!callback_);
 }
 
 void FakeAudioRendererSink::Initialize(const AudioParameters& params,
                                        RenderCallback* callback) {
-  DCHECK_EQ(state_, kUninitialized);
+  DCHECK(state_ == kUninitialized || state_ == kStopped);
   DCHECK(!callback_);
   DCHECK(callback);
 
   callback_ = callback;
   ChangeState(kInitialized);
 }
 
 void FakeAudioRendererSink::Start() {
   DCHECK_EQ(state_, kInitialized);
   ChangeState(kStarted);
@@ skipping 54 matching lines @@
     "kPlaying",
     "kStopped"
   };
 
   DVLOG(1) << __func__ << " : " << kStateNames[state_] << " -> "
            << kStateNames[new_state];
   state_ = new_state;
 }
 
 }  // namespace media