Support (E)AC3 passthrough

media/base/audio_buffer.h

Index: media/base/audio_buffer.h
diff --git a/media/base/audio_buffer.h b/media/base/audio_buffer.h
index d03a02ed4fcfa1ea7ffd2bbae91e0c669a37cb2a..568f963d51f71c37dc851b77ebc7694e0a7147f6 100644
--- a/media/base/audio_buffer.h
+++ b/media/base/audio_buffer.h
@@ -55,7 +55,8 @@ class MEDIA_EXPORT AudioBuffer
                                              int sample_rate,
                                              int frame_count,
                                              const uint8_t* const* data,
-                                             const base::TimeDelta timestamp);
+                                             const base::TimeDelta timestamp,
+                                             const size_t data_size = 0);
 
   // Create an AudioBuffer with |frame_count| frames. Buffer is allocated, but
   // not initialized. Timestamp and duration are set to kNoTimestamp.
@@ -63,7 +64,8 @@ class MEDIA_EXPORT AudioBuffer
                                                  ChannelLayout channel_layout,
                                                  int channel_count,
                                                  int sample_rate,
-                                                 int frame_count);
+                                                 int frame_count,
+                                                 size_t data_size = 0);
 
   // Create an empty AudioBuffer with |frame_count| frames.
   static scoped_refptr<AudioBuffer> CreateEmptyBuffer(
@@ -117,6 +119,9 @@ class MEDIA_EXPORT AudioBuffer
   // Return the sample rate.
   int sample_rate() const { return sample_rate_; }
 
+  // Return the sample format.
+  SampleFormat sample_format() const { return sample_format_; }
+
   // Return the channel layout.
   ChannelLayout channel_layout() const { return channel_layout_; }
 
@@ -157,6 +162,7 @@ class MEDIA_EXPORT AudioBuffer
               int frame_count,
               bool create_buffer,
               const uint8_t* const* data,
+              size_t data_size,
               const base::TimeDelta timestamp);
 
   virtual ~AudioBuffer();