Declare intent to use sample-aes later in the stream.

media/formats/mp2t/mp2t_stream_parser_unittest.cc

Index: media/formats/mp2t/mp2t_stream_parser_unittest.cc
diff --git a/media/formats/mp2t/mp2t_stream_parser_unittest.cc b/media/formats/mp2t/mp2t_stream_parser_unittest.cc
index 3555b914199f2de299192d8bfabba5bea17a3b62..64080eecf332c26eb4fdf21fe2de7acf6b592669 100644
--- a/media/formats/mp2t/mp2t_stream_parser_unittest.cc
+++ b/media/formats/mp2t/mp2t_stream_parser_unittest.cc
@@ -504,6 +504,19 @@ TEST_F(Mp2tStreamParserTest, HLSSampleAES) {
     EXPECT_EQ(decrypted_audio_buffers[i], unencrypted_audio_buffer);
   }
 }
+
+TEST_F(Mp2tStreamParserTest, PrepareForHLSSampleAES) {
+  InitializeParser();
+  ParseMpeg2TsFile("bear-1280x720-hls-with-CAT.bin", 2048);
+  parser_->Flush();
+  EncryptionScheme video_encryption_scheme =
+      current_video_config_.encryption_scheme();
+  EXPECT_TRUE(video_encryption_scheme.is_encrypted());
+  EncryptionScheme audio_encryption_scheme =
+      current_audio_config_.encryption_scheme();
+  EXPECT_TRUE(audio_encryption_scheme.is_encrypted());
+}
+
 #endif
 
 }  // namespace mp2t