media config: expand is_encrypted to a struct.

media/base/audio_decoder_config.h

Index: media/base/audio_decoder_config.h
diff --git a/media/base/audio_decoder_config.h b/media/base/audio_decoder_config.h
index 71c893028fff82148b72eb706daad1f69e68d346..266de82d605277543a3fec40b2c5a8faec165266 100644
--- a/media/base/audio_decoder_config.h
+++ b/media/base/audio_decoder_config.h
@@ -14,6 +14,7 @@
 #include "base/time/time.h"
 #include "media/base/audio_codecs.h"
 #include "media/base/channel_layout.h"
+#include "media/base/encryption_scheme.h"
 #include "media/base/media_export.h"
 #include "media/base/sample_format.h"
 
@@ -34,7 +35,7 @@ class MEDIA_EXPORT AudioDecoderConfig {
                      ChannelLayout channel_layout,
                      int samples_per_second,
                      const std::vector<uint8_t>& extra_data,
-                     bool is_encrypted);
+                     const EncryptionScheme& encryption_scheme);
 
   AudioDecoderConfig(const AudioDecoderConfig& other);
 
@@ -46,7 +47,7 @@ class MEDIA_EXPORT AudioDecoderConfig {
                   ChannelLayout channel_layout,
                   int samples_per_second,
                   const std::vector<uint8_t>& extra_data,
-                  bool is_encrypted,
+                  const EncryptionScheme& encryption_scheme,
                   base::TimeDelta seek_preroll,
                   int codec_delay);
 
@@ -79,7 +80,12 @@ class MEDIA_EXPORT AudioDecoderConfig {
   // Whether the audio stream is potentially encrypted.
   // Note that in a potentially encrypted audio stream, individual buffers
   // can be encrypted or not encrypted.
-  bool is_encrypted() const { return is_encrypted_; }
+  bool is_encrypted() const { return encryption_scheme_.is_encrypted(); }
+
+  // Encryption scheme used for encrypted buffers.
+  const EncryptionScheme& encryption_scheme() const {
+    return encryption_scheme_;
+  }
 
  private:
   AudioCodec codec_;
@@ -89,7 +95,7 @@ class MEDIA_EXPORT AudioDecoderConfig {
   int samples_per_second_;
   int bytes_per_frame_;
   std::vector<uint8_t> extra_data_;
-  bool is_encrypted_;
+  EncryptionScheme encryption_scheme_;
 
   // |seek_preroll_| is the duration of the data that the decoder must decode
   // before the decoded data is valid.