Adding new function ReadFrames() that returns the audio frame in planar

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 a07985c9fd8ca9fb4f3545f429ee851c5cdad363..843f624e55d1f631d278345a2bdfcd69259adcc8 100644
--- a/media/base/audio_buffer.h
+++ b/media/base/audio_buffer.h
@@ -73,6 +73,10 @@ class MEDIA_EXPORT AudioBuffer
                   int dest_frame_offset,
                   AudioBus* dest);
 
+  // Copy |frames_to_copy| frames into |dest|. The frames are converted from
+  // their source format into interleaved int32.
+  void ReadFramesInterleavedS32(int frames_to_copy, int32* dest);
+
   // Trim an AudioBuffer by removing |frames_to_trim| frames from the start.
   // Timestamp and duration are adjusted to reflect the fewer frames.
   // Note that repeated calls to TrimStart() may result in timestamp() and