Part 1: Plumb render view ID to render host

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 818bed8b91d04f2483243d7179e7b9ad2cb06daa..d5ee213e499b4441cb495422045d00b98dd857c2 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 ChannelLayout kChannelLayout = CHANNEL_LAYOUT_STEREO;
+static const int kRenderViewId = -2;
 
 // By sub-classing AudioDeviceFactory we've overridden the factory to use our
 // CreateAudioDevice() method globally.
@@ -52,7 +53,7 @@ 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) {
@@ -119,7 +120,8 @@ 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