6b11db03526ce5d8a6be2d9045bf67890da19b5e
Fixes MatrixFilterContents rendering/coverage #52880 (flutter/engine#52939)
fixes https://github.com/flutter/flutter/issues/147807 relands https://github.com/flutter/engine/pull/52880 relands https://github.com/flutter/engine/pull/43943 This was previously reverted because of the golden test failure `widgets.widgets.magnifier.styled`. This fixes that problem by instead of focusing on ImageFilter and BackdropFilter subpasses, instead focuses on wether a subpass is clipped or not and by extension how the math should be handled. `widgets.widgets.magnifier.styled` after diff:  [C++, Objective-C, Java style guides]: https://github.com/flutter/engine/blob/main/CONTRIBUTING.md#style
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