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Reverts https://github.com/flutter/engine/pull/52725 This commit makes some long-needed internal improvements to the way that the DisplayListBuilder manages its per-save/saveLayer data. The information for layer bounds and matrix/clips is now maintained in the layer info structure itself rather than shared across a number of stack structures which required careful alignment of the 3 different stacks and made it more difficult to compare and update adjacent layers during save and restore operations. The new code stores all information for a layer within a single structure and the save and restore operations can be more clear about which information they are getting or setting in the current and parent layers. In addition, the layer bounds accumulations were updated to have a more flexible algorithm for detecting overlap of rendering operations for the opacity peephole optimization. Previously, more than one rendering op on a layer would prevent opacity peephole optimizations, but now the condition will be recognized until the first rendering op that overlaps the bounds of the previous rendering operations. This will help for some potentially common cases of 2 non-overlapping ops or even a list of rendering operations laid out in a row.