Enable pcm_s32le audio decoding.

media/base/audio_buffer.cc

Index: media/base/audio_buffer.cc
diff --git a/media/base/audio_buffer.cc b/media/base/audio_buffer.cc
index 564cff156bbb7f5defa7067439731a1efa44c500..115efa51f3fb4f9c0236d56b3b85c63a88d22e33 100644
--- a/media/base/audio_buffer.cc
+++ b/media/base/audio_buffer.cc
@@ -317,6 +317,7 @@ void ReadFramesInterleaved(const std::vector<uint8*>& channel_data,
       InterleaveAndConvert<int16, Dest>(
           channel_data, frames_to_copy * channel_count, trim_start, dest_data);
       break;
+    case kSampleFormatS24:
     case kSampleFormatS32:
       InterleaveAndConvert<int32, Dest>(
           channel_data, frames_to_copy * channel_count, trim_start, dest_data);
@@ -404,6 +405,7 @@ void AudioBuffer::TrimRange(int start, int end) {
         break;
       case kSampleFormatU8:
       case kSampleFormatS16:
+      case kSampleFormatS24:
       case kSampleFormatS32:
       case kSampleFormatF32: {
         // Interleaved data can be shifted all at once.