Chrome AI Summarizer User Activation Handling

[pm-azhar-mulla]

Type of change

• Feature

Description of change

Fixed : #14284

This PR addresses an issue where the Chrome AI Summarizer API initialization would fail with a NotAllowedError if the model required downloading and the page load occurred without a user gesture (sticky activation).

When Summarizer.availability() returns a status indicating a download is needed (e.g., 'after-download'), the browser prevents the download from starting unless a user gesture is present.

This change implements a robust check:

• Verifies Summarizer.availability().
• If a download is needed AND navigator.userActivation.isActive is false, the module now defers initialization.
• It explicitly waits for a user interaction (using a list of activation events) before retrying the initialization.

This ensures the module does not error out silently or noisily on page load and properly initializes once the user interacts with the page, complying with valid sticky activation requirements.

Reference Links:
https://developer.chrome.com/docs/ai/get-started#user-activation
https://developer.mozilla.org/en-US/docs/Glossary/Sticky_activation

Other information