Clean up audio-related utility functions to compute buffer sizes

content/browser/renderer_host/media/audio_renderer_host_unittest.cc

 // 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.
 
 #include "base/bind.h"
 #include "base/environment.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop.h"
 #include "base/process_util.h"
 #include "base/sync_socket.h"
@@ skipping 185 matching lines @@
         .WillOnce(QuitMessageLoop(message_loop_.get()));
 
     AudioParameters params;
     if (mock_stream_)
       params.format = AudioParameters::AUDIO_MOCK;
     else
       params.format = AudioParameters::AUDIO_PCM_LINEAR;
     params.channels = 2;
     params.sample_rate = AudioParameters::kAudioCDSampleRate;
     params.bits_per_sample = 16;
-    params.samples_per_packet = 0;
+    params.samples_per_packet = AudioParameters::kAudioCDSampleRate / 10;
 
     // Send a create stream message to the audio output stream and wait until
     // we receive the created message.
     host_->OnCreateStream(kStreamId, params);
     message_loop_->Run();
   }
 
   void Close() {
     EXPECT_CALL(*observer_,
                 OnSetAudioStreamStatus(_, kStreamId, "closed"));
@@ skipping 183 matching lines @@
     EnableRealDevice();
 
   Create();
   Play();
   SimulateError();
   Close();
 }
 
 
 // TODO(hclam): Add tests for data conversation in low latency mode.