Add support for config changes during playback to FFmpegVideoDecoder.

media/filters/chunk_demuxer_unittest.cc

Index: media/filters/chunk_demuxer_unittest.cc
diff --git a/media/filters/chunk_demuxer_unittest.cc b/media/filters/chunk_demuxer_unittest.cc
index 2d04f5122b96fa2270a0a06c542daf983e285cfe..c1cec5835ed63666bad6d98c7ff70662a6749367 100644
--- a/media/filters/chunk_demuxer_unittest.cc
+++ b/media/filters/chunk_demuxer_unittest.cc
@@ -2056,10 +2056,6 @@ TEST_F(ChunkDemuxerTest, TestConfigChange_Video) {
   ASSERT_EQ(status, DemuxerStream::kConfigChanged);
   EXPECT_EQ(last_timestamp.InMilliseconds(), 501);
 
-  // Verify that another read will result in kConfigChanged being returned
-  // again.
-  ExpectConfigChanged(stream);
-
   // Fetch the new decoder config.
   const VideoDecoderConfig& video_config_2 = stream->video_decoder_config();
   ASSERT_TRUE(video_config_2.IsValidConfig());
@@ -2073,9 +2069,6 @@ TEST_F(ChunkDemuxerTest, TestConfigChange_Video) {
   ASSERT_EQ(status, DemuxerStream::kConfigChanged);
   EXPECT_EQ(last_timestamp.InMilliseconds(), 793);
 
-  // Verify we get another ConfigChanged status.
-  ExpectConfigChanged(stream);
-
   // Get the new config and verify that it matches the first one.
   ASSERT_TRUE(video_config_1.Matches(stream->video_decoder_config()));
 
@@ -2110,10 +2103,6 @@ TEST_F(ChunkDemuxerTest, TestConfigChange_Audio) {
   ASSERT_EQ(status, DemuxerStream::kConfigChanged);
   EXPECT_EQ(last_timestamp.InMilliseconds(), 524);
 
-  // Verify that another read will result in kConfigChanged being returned
-  // again.
-  ExpectConfigChanged(stream);
-
   // Fetch the new decoder config.
   const AudioDecoderConfig& audio_config_2 = stream->audio_decoder_config();
   ASSERT_TRUE(audio_config_2.IsValidConfig());
@@ -2127,9 +2116,6 @@ TEST_F(ChunkDemuxerTest, TestConfigChange_Audio) {
   ASSERT_EQ(status, DemuxerStream::kConfigChanged);
   EXPECT_EQ(last_timestamp.InMilliseconds(), 759);
 
-  // Verify we get another ConfigChanged status.
-  ExpectConfigChanged(stream);
-
   // Get the new config and verify that it matches the first one.
   ASSERT_TRUE(audio_config_1.Matches(stream->audio_decoder_config()));