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This enhances the overlay optimization by delaying combining pictures to get tighter bounds for the pictures that make up the scene, enabling more sophisticated optimization since we can determine if they intersect with platform views on a per-picture basis. Fixes https://github.com/flutter/flutter/issues/149863 Fixes https://github.com/flutter/flutter/issues/155833 On a Macbook in Chrome in an example app with an infinite scrolling grid of platform views, this brings the ratio of dropped frames from 93% to 55% (roughly 4 fps to 30 fps). This is a reland of https://github.com/flutter/engine/pull/54878 with a fix for scenes with pictures and shader masks that are eventually entirely clipped out. It also fixes a performance issue caused by making too many Canvases just to record the size of the picture elements in the scene. [C++, Objective-C, Java style guides]: https://github.com/flutter/engine/blob/main/CONTRIBUTING.md#style