53c07de30cde45097a7739fa16b5fb8f0dcba401
[Impeller] new blur: refactored math and fixed expanded padding size (flutter/engine#49302)
https://github.com/flutter/engine/pull/49206 had to reland because it had integration failures. The changes are in a separate commit below. [C++, Objective-C, Java style guides]: https://github.com/flutter/engine/blob/main/CONTRIBUTING.md#style
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