Plumb render view ID from audio-related code in renderer through IPCs to AudioRendererHost in brows…

content/renderer/media/audio_renderer_mixer_manager_unittest.cc

Index: content/renderer/media/audio_renderer_mixer_manager_unittest.cc
diff --git a/content/renderer/media/audio_renderer_mixer_manager_unittest.cc b/content/renderer/media/audio_renderer_mixer_manager_unittest.cc
index 40b642e44b0e981cc60a915ca1a7721c81230608..4560045bce305a1d2f57f01286b1524879df0ab6 100644
--- a/content/renderer/media/audio_renderer_mixer_manager_unittest.cc
+++ b/content/renderer/media/audio_renderer_mixer_manager_unittest.cc
@@ -18,6 +18,7 @@ static const int kBitsPerChannel = 16;
 static const int kSampleRate = 48000;
 static const int kBufferSize = 8192;
 static const media::ChannelLayout kChannelLayout = media::CHANNEL_LAYOUT_STEREO;
+static const int kRenderViewId = -2;
 
 // By sub-classing AudioDeviceFactory we've overridden the factory to use our
 // CreateAudioDevice() method globally.
@@ -27,14 +28,16 @@ class MockAudioRenderSinkFactory : public AudioDeviceFactory {
   virtual ~MockAudioRenderSinkFactory() {}
 
  protected:
-  virtual media::MockAudioRendererSink* CreateOutputDevice() OVERRIDE {
+  virtual media::MockAudioRendererSink* CreateOutputDevice(int render_view_id)
+      OVERRIDE {
     media::MockAudioRendererSink* sink = new media::MockAudioRendererSink();
     EXPECT_CALL(*sink, Start());
     EXPECT_CALL(*sink, Stop());
     return sink;
   }
 
-  virtual media::AudioInputDevice* CreateInputDevice() OVERRIDE {
+  virtual media::AudioInputDevice* CreateInputDevice(int render_view_id)
+      OVERRIDE {
     ADD_FAILURE();
     return NULL;
   }
@@ -52,16 +55,22 @@ class AudioRendererMixerManagerTest : public testing::Test {
   }
 
   media::AudioRendererMixer* GetMixer(const media::AudioParameters& params) {
-    return manager_->GetMixer(params);
+    return manager_->GetMixer(kRenderViewId, params);
   }
 
   void RemoveMixer(const media::AudioParameters& params) {
-    return manager_->RemoveMixer(params);
+    return manager_->RemoveMixer(kRenderViewId, params);
   }
 
   // Number of instantiated mixers.
   int mixer_count() {
-    return manager_->mixers_.size();
+    int count = 0;
+    typedef AudioRendererMixerManager::AudioRendererMixerMap MixerMap;
+    for (MixerMap::const_iterator it = manager_->mixers_.begin();
+         it != manager_->mixers_.end(); ++it) {
+      count += it->second.size();
+    }
+    return count;
   }
 
  protected:
@@ -119,7 +128,8 @@ TEST_F(AudioRendererMixerManagerTest, CreateInput) {
 
   // Create a mixer input and ensure it doesn't instantiate a mixer yet.
   EXPECT_EQ(mixer_count(), 0);
-  scoped_refptr<media::AudioRendererMixerInput> input(manager_->CreateInput());
+  scoped_refptr<media::AudioRendererMixerInput> input(
+      manager_->CreateInput(kRenderViewId));
   EXPECT_EQ(mixer_count(), 0);
 
   // Implicitly test that AudioRendererMixerInput was provided with the expected