feat: Add MSE support for series 3 & 4 devices OS-19598

[t-bashir-bs]

Description of Change

This PR adds support for Media Source Extensions (MSE) to the Brightsign video player in Chromium. The changes have been ported from the implementation made for QtWebEngine for Brightsign devices.

1. PumpData:
   Calls are made to ChunkDemuxerStream::Read when the demuxer is not initialized yet, in the older Chromium this was just ignored with NOTREACHED, but in the newer version NOTREACHED_NORETURN gets called which
   crashes the renderer. We now check if the demuxer is initialized before calling ChunkDemuxerStream::Read.

2. OnDemuxInitialized:
   The first_party_url was used in Chromium 87 but in Chromium 120 we don't have
   this and so like non-mse playback use the representative_url with the top_frame_origin.

Verified using:

1. Bitmovin MSE-demo
2. Vimeo
3. YouTube
4. Carson MSE conformance test

Checklist

• PR description included and stakeholders cc'd
• npm test passes
• tests are changed or added
• relevant documentation, tutorials, templates and examples are changed or added
• PR release notes describe the change in a way relevant to app developers, and are capitalized, punctuated, and past tense.

Release Notes

Notes:

[Copilot]

Copilot encountered an error and was unable to review this pull request. You can try again by re-requesting a review.

[Copilot]

Copilot encountered an error and was unable to review this pull request. You can try again by re-requesting a review.

[Copilot]

Copilot encountered an error and was unable to review this pull request. You can try again by re-requesting a review.