Wire up codec_delay() to MP3StreamParser and FFmpegAudioDecoder.

media/formats/mpeg/mp3_stream_parser_unittest.cc

Index: media/formats/mpeg/mp3_stream_parser_unittest.cc
diff --git a/media/formats/mpeg/mp3_stream_parser_unittest.cc b/media/formats/mpeg/mp3_stream_parser_unittest.cc
index c5b5aeb18699d6efb93e240823bd6fc135257fd6..1638752715998371cd37b1b3932de409d5c0eb23 100644
--- a/media/formats/mpeg/mp3_stream_parser_unittest.cc
+++ b/media/formats/mpeg/mp3_stream_parser_unittest.cc
@@ -40,6 +40,7 @@ TEST_F(MP3StreamParserTest, UnalignedAppend) {
       "{ 0K }"
       "EndOfSegment";
   EXPECT_EQ(expected, ParseFile("sfx.mp3", 17));
+  EXPECT_GT(last_audio_config().codec_delay(), 0);
 }
 
 // Test parsing with a larger piece size to verify that multiple buffers
@@ -55,6 +56,7 @@ TEST_F(MP3StreamParserTest, UnalignedAppend512) {
       "{ 0K }"
       "EndOfSegment";
   EXPECT_EQ(expected, ParseFile("sfx.mp3", 512));
+  EXPECT_GT(last_audio_config().codec_delay(), 0);
 }
 
 TEST_F(MP3StreamParserTest, MetadataParsing) {