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 11a48e1dd104b70c935e9f1f864a7883734b489c..5e638e55ead014d3db1007623a5e00b270411a1e 100644
--- a/media/BUILD.gn
+++ b/media/BUILD.gn
@@ -20,6 +20,7 @@ buildflag_header("media_features") {
     "ENABLE_HEVC_DEMUXING=$enable_hevc_demuxing",
     "ENABLE_MSE_MPEG2TS_STREAM_PARSER=$enable_mse_mpeg2ts_stream_parser",
     "ENABLE_MP4_VP9_DEMUXING=0",
+    "ENABLE_HLS_SAMPLE_AES=$enable_hls_sample_aes",
   ]
 }
 
@@ -405,6 +406,8 @@ component("media") {
     ]
     if (enable_mse_mpeg2ts_stream_parser) {
       sources += [
+        "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",
@@ -432,6 +435,16 @@ component("media") {
         "formats/mp2t/ts_section_psi.cc",
         "formats/mp2t/ts_section_psi.h",
       ]
+      if (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",
+        ]
+      }
     }
   }
 
@@ -668,6 +681,9 @@ 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) {