This bug has an owner, thus, it's been triaged. Changing status to "assigned".

Closing this, as its no longer necessary. The logic has been changed such that:

- freezing is initiated in the browser, and dispatched to each individual frame. During that time the page is in a PENDING_FREEZE state.
- each individual frame transitions, and reports its lifecycle state transition to the browser.
- once all frames in a frame-tree have transitioned, the page transitions state.