[Proposal] DEBUG_ELEMENT: Add hdr information to video Representation

This has been a request: to clearly indicate when the current
Representation has linked HDR information in our debug element.

I don't think it causes issue and it makes sense, so I wrote the
proposal commit here.

src/main_thread/api/debug/modules/segment_buffer_content.ts

@@ -155,7 +155,7 @@ function constructRepresentationInfo(content: {
     isSignInterpreted,
     type: bufferType,
   } = content.adaptation;
-  const { id, height, width, bitrate, codecs } = content.representation;
+  const { id, height, width, bitrate, codecs, hdrInfo } = content.representation;
   let representationInfo = `"${id}" `;
   if (height !== undefined && width !== undefined) {
     representationInfo += `${width}x${height} `;
@@ -169,6 +169,9 @@ function constructRepresentationInfo(content: {
   if (language !== undefined) {
     representationInfo += `l:"${language}" `;
   }
+  if (bufferType === "video" && hdrInfo !== undefined) {
+    representationInfo += "hdr:1 ";
+  }
   if (bufferType === "video" && typeof isSignInterpreted === "boolean") {
     representationInfo += `si:${isSignInterpreted ? 1 : 0} `;
   }