media config: expand is_encrypted to a struct.

media/mojo/interfaces/media_types.mojom

Index: media/mojo/interfaces/media_types.mojom
diff --git a/media/mojo/interfaces/media_types.mojom b/media/mojo/interfaces/media_types.mojom
index 085256eac3a139d30c26905ba51c1d4dd508dd21..de7db32e0db2e6abec65f083b3a659454dd15779 100644
--- a/media/mojo/interfaces/media_types.mojom
+++ b/media/mojo/interfaces/media_types.mojom
@@ -168,6 +168,29 @@ enum VideoCodecProfile {
   VIDEO_CODEC_PROFILE_MAX = VP9PROFILE_MAX,
 };
 
+// See media/base/encryption_scheme.h.
+// Kept in sync with media::CipherMode via static_asserts.
+enum CipherMode {
+  Unencrypted = 0,
+  AesCtr,
+  AesCbc,
+  Max = AesCbc
+};
+
+// This defines a mojo transport format for media::EncryptionScheme::PatternSpec
+// See media/base/encryption_scheme.h for description.
+struct PatternSpec {
+  uint32 encrypt_blocks;
+  uint32 skip_blocks;
+};
+
+// This defines a mojo transport format for media::EncryptionScheme.
+// See media/base/encryption_scheme.h for description.
+struct EncryptionScheme {
+  CipherMode mode;
+  PatternSpec pattern;
+};
+
 // This defines a mojo transport format for media::AudioDecoderConfig.
 // See media/base/audio_decoder_config.h for descriptions.
 struct AudioDecoderConfig {
@@ -178,7 +201,7 @@ struct AudioDecoderConfig {
   array<uint8>? extra_data;
   int64 seek_preroll_usec;
   int32 codec_delay;
-  bool is_encrypted;
+  EncryptionScheme encryption_scheme;
 };
 
 // This defines a mojo transport format for media::VideoDecoderConfig.
@@ -192,7 +215,7 @@ struct VideoDecoderConfig {
   mojo.Rect visible_rect;
   mojo.Size natural_size;
   array<uint8>? extra_data;
-  bool is_encrypted;
+  EncryptionScheme encryption_scheme;
 };
 
 // This defines a mojo transport format for media::SubsampleEntry.