Implement MojoAudioRendererSink and use it in UtilityMojoMediaClient

media/base/audio_bus.h

Index: media/base/audio_bus.h
diff --git a/media/base/audio_bus.h b/media/base/audio_bus.h
index 6d381ccac3daa3c9325fb9d4af99259e4cef3825..2752ec871c9724d49f45d0e58437e8abdfae8e3d 100644
--- a/media/base/audio_bus.h
+++ b/media/base/audio_bus.h
@@ -15,9 +15,20 @@
 #include "base/memory/ref_counted.h"
 #include "media/base/media_export.h"
 
+namespace mojo {
+template <typename T, typename U>
+struct TypeConverter;
+template <typename T>
+class StructPtr;
+};
+
 namespace media {
 class AudioParameters;
 
+namespace mojom {
+class AudioBus;
+}
+
 // Represents a sequence of audio frames containing frames() audio samples for
 // each of channels() channels. The data is stored as a set of contiguous
 // float arrays with one array per channel. The memory for the arrays is either
@@ -187,6 +198,10 @@ class MEDIA_EXPORT AudioBus {
   explicit AudioBus(int channels);
 
  private:
+  // mojo::TypeConverter added as a friend so that AudioBus can be
+  // transferred across a mojo connection.
+  friend struct mojo::TypeConverter<mojo::StructPtr<mojom::AudioBus>, AudioBus>;
+
   // Helper method for building |channel_data_| from a block of memory.  |data|
   // must be at least CalculateMemorySize(...) bytes in size.
   void BuildChannelData(int channels, int aligned_frame, float* data);
@@ -209,6 +224,7 @@ class MEDIA_EXPORT AudioBus {
 
   // Contiguous block of channel memory.
   std::unique_ptr<float, base::AlignedFreeDeleter> data_;
+  size_t data_size_;
 
   // One float pointer per channel pointing to a contiguous block of memory for
   // that channel. If the memory is owned by this instance, this will