Ready to Use YouTube Playables SDK for Unity WebG

[crudeGithub]

Summary

Integrates the YouTube Playables Web SDK wrapper into the project to support YouTube WebGL playable requirements.

Key Changes

• YouTube SDK Bridge: Added C# wrappers and JS plugins (.jslib) for game ready/lifecycle, cloud saves, scores, ads, audio sync, and pausing.
• Automatic WebGL Build Patching: Added an editor build postprocessor to automatically inject the YouTube SDK script and initialization hooks into the built index.html.
• Editor Fallbacks: Implemented fallback saving (via PlayerPrefs) and ad simulators to allow local development and testing.
• Documentation & Samples: Included step-by-step setup guides (INTEGRATION_GUIDE.md) and a sample script for integration references.

Verification

• Verify build output contains the YouTube script in index.html.
• Verify Editor testing falls back to PlayerPrefs and does not crash.

[bclarkss]

Thanks for contributing, we greatly appreciate your willingness to help improve the development experience.

There are a couple things blocking us from taking this PR though.

Documentation & Samples: Included step-by-step setup guides (INTEGRATION_GUIDE.md) and a sample script for integration references.

These docs are slightly out of date and we should be pointing to https://developers.google.com/youtube/gaming/playables/ to ensure we stay up to date with changes on the platform and reference materials.

Automatic WebGL Build Patching: Added an editor build postprocessor to automatically inject the YouTube SDK script and initialization hooks into the built index.html.

This is a nice solution, but it misses some of the important elements that make https://developers.google.com/youtube/gaming/playables/samples/unity_wrapper#webgl_template work across web/mobile platforms.

Additionally, this does not take into account when project files are to large for ingestion (e.g. .wasm, .data) and might need to follow a different compression path.
https://developers.google.com/youtube/gaming/playables/certification/requirements_stability#3_individual_file_size

Editor Fallbacks: Implemented fallback saving (via PlayerPrefs) and ad simulators to allow local development and testing.

Great add.

YouTube SDK Bridge: Added C# wrappers and JS plugins (.jslib) for game ready/lifecycle, cloud saves, scores, ads, audio sync, and pausing.

For many games this would be a good add as well.