Allow AudioRendererMixerInputs to be restarted after stopped.

media/base/audio_renderer_mixer_input_unittest.cc

Index: media/base/audio_renderer_mixer_input_unittest.cc
diff --git a/media/base/audio_renderer_mixer_input_unittest.cc b/media/base/audio_renderer_mixer_input_unittest.cc
index 9a019db57171c8284b62d4b3f97e77b03117dd91..be03867027f0963bc38fca13eb386827948527d7 100644
--- a/media/base/audio_renderer_mixer_input_unittest.cc
+++ b/media/base/audio_renderer_mixer_input_unittest.cc
@@ -28,7 +28,6 @@ class AudioRendererMixerInputTest : public testing::Test {
     CreateMixerInput();
     fake_callback_.reset(new FakeAudioRenderCallback(0));
     mixer_input_->Initialize(audio_parameters_, fake_callback_.get());
-    EXPECT_CALL(*this, RemoveMixer(testing::_));
     audio_bus_ = AudioBus::Create(audio_parameters_);
   }
 
@@ -49,6 +48,7 @@ class AudioRendererMixerInputTest : public testing::Test {
       mixer_.reset(new AudioRendererMixer(
           audio_parameters_, audio_parameters_, sink));
     }
+    EXPECT_CALL(*this, RemoveMixer(testing::_));
     return mixer_.get();
   }
 
@@ -109,4 +109,12 @@ TEST_F(AudioRendererMixerInputTest, StopBeforeInitializeOrStart) {
   mixer_input_->Stop();
 }
 
+// Test that Start() can be called after Stop().
+// TODO(dalecurtis): We shouldn't allow this.  See http://crbug.com/151051
+TEST_F(AudioRendererMixerInputTest, StartAfterStop) {
+  mixer_input_->Stop();
+  mixer_input_->Start();
+  mixer_input_->Stop();
+}
+
 }  // namespace media