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

media/formats/mp2t/descriptors.h

Index: media/formats/mp2t/descriptors.h
diff --git a/media/formats/mp2t/descriptors.h b/media/formats/mp2t/descriptors.h
index cfbca63578c7b5ebe00dadb193cb8cd6dff65638..6737d09a6287502bab05d5a148b4416d6cd024a3 100644
--- a/media/formats/mp2t/descriptors.h
+++ b/media/formats/mp2t/descriptors.h
@@ -13,6 +13,7 @@
 namespace media {
 
 class BitReader;
+class EncryptionScheme;
 
 namespace mp2t {
 
@@ -46,9 +47,11 @@ class Descriptors {
 
   // Indicates whether a CA descriptor is present, and if so, whether it is
   // of the type defined by ISO/IEC 23001-9:2014 (i.e. with a specific
-  // system_id value and layout of the private_data). If so, the |ca_pid| and
-  // |pssh_pid| are populated with the contents of the descriptor.
-  bool HasCADescriptorCenc(int* ca_pid, int* pssh_pid) const;
+  // system_id value and layout of the private_data). If so, the |ca_pid|,
+  // |pssh_pid| and |scheme| are populated with the contents of the descriptor.
+  bool HasCADescriptorCenc(int* ca_pid,
+                           int* pssh_pid,
+                           EncryptionScheme* scheme) const;
 
   // Indicates whether a Private Data Indicator descriptor is present with a
   // particular |value|.