Support HLS MPEG2 TS with SAMPLE-AES encryption.

media/BUILD.gn

Index: media/BUILD.gn
diff --git a/media/BUILD.gn b/media/BUILD.gn
index eb4c38fe50eca0d4f9c52608d7c44060090a0cb7..cf27ff1f64ec9fd4d3f3a0a1d1640adfd312ab5f 100644
--- a/media/BUILD.gn
+++ b/media/BUILD.gn
@@ -38,6 +38,9 @@ config("media_config") {
   if (proprietary_codecs && enable_hevc_demuxing) {
     defines += [ "ENABLE_HEVC_DEMUXING" ]
   }
+  if (proprietary_codecs && enable_hls_sample_aes) {
+    defines += [ "ENABLE_HLS_SAMPLE_AES" ]
+  }
 }
 
 config("media_implementation") {
@@ -361,6 +364,17 @@ component("media") {
     }
   }
 
+  if (proprietary_codecs && enable_hls_sample_aes) {
+    sources += [
+      "formats/mp2t/ts_section_cat.cc",
+      "formats/mp2t/ts_section_cat.h",
+      "formats/mp2t/ts_section_cets_ecm.cc",
+      "formats/mp2t/ts_section_cets_ecm.h",
+      "formats/mp2t/ts_section_cets_pssh.cc",
+      "formats/mp2t/ts_section_cets_pssh.h",
+    ]
+  }
+
   if (current_cpu == "arm" && arm_use_neon) {
     defines += [ "USE_NEON" ]
   }
@@ -480,6 +494,8 @@ component("media") {
       "cdm/cenc_utils.h",
       "filters/h264_to_annex_b_bitstream_converter.cc",
       "filters/h264_to_annex_b_bitstream_converter.h",
+      "formats/mp2t/descriptors.cc",
+      "formats/mp2t/descriptors.h",
       "formats/mp2t/es_adapter_video.cc",
       "formats/mp2t/es_adapter_video.h",
       "formats/mp2t/es_parser.cc",
@@ -770,6 +786,9 @@ test("media_unittests") {
     if (enable_hevc_demuxing) {
       sources += [ "filters/h265_parser_unittest.cc" ]
     }
+    if (enable_hls_sample_aes) {
+      deps += [ "//third_party/boringssl" ]
+    }
   }
 
   if (is_mac || is_ios) {