[GStreamer][EME] Add opus codec support for CENC encrypted contents

https://bugs.webkit.org/show_bug.cgi?id=267529

Reviewed by Philippe Normand.

Patch by kkanag314 <krishnapriya_kanagaraj@comcast.com>.

* Source/WebCore/platform/graphics/gstreamer/eme/WebKitThunderDecryptorGStreamer.cpp:

Canonical link: https://commits.webkit.org/273041@main

Author: calvaris

Source/WebCore/platform/graphics/gstreamer/eme/WebKitThunderDecryptorGStreamer.cpp

@@ -46,7 +46,8 @@ static bool decrypt(WebKitMediaCommonEncryptionDecrypt*, GstBuffer* iv, GstBuffe
 GST_DEBUG_CATEGORY(webkitMediaThunderDecryptDebugCategory);
 #define GST_CAT_DEFAULT webkitMediaThunderDecryptDebugCategory
 
-static const char* cencEncryptionMediaTypes[] = { "video/mp4", "audio/mp4", "video/x-h264", "video/x-h265", "audio/mpeg", "audio/x-eac3", "audio/x-ac3", "audio/x-flac", "video/x-vp9", nullptr };
+static const char* cencEncryptionMediaTypes[] = { "video/mp4", "audio/mp4", "video/x-h264", "video/x-h265", "audio/mpeg",
+    "audio/x-eac3", "audio/x-ac3", "audio/x-flac", "audio/x-opus", "video/x-vp9", nullptr };
 static const char* webmEncryptionMediaTypes[] = { "video/webm", "audio/webm", "video/x-vp9", "audio/x-opus", "audio/x-vorbis", "video/x-vp8", nullptr };
 
 static GstStaticPadTemplate srcTemplate = GST_STATIC_PAD_TEMPLATE("src",