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relands https://github.com/flutter/engine/pull/54473 issue: https://github.com/flutter/flutter/issues/127855 integration test: https://github.com/flutter/engine/pull/54415 This is the engine side changes required for wide gamut framework support. It changes the internal representation of DlColor to be floats. It will be married with https://github.com/flutter/engine/pull/54415 when it lands in https://github.com/flutter/engine/pull/54567. ## Difference from last attempt 1) The default color is now opaque black, not transparent black (not the issue for revert) 1) Updated a test to send in valid numbers when constructing a color and added asserts to avoid those problems in the future. [C++, Objective-C, Java style guides]: https://github.com/flutter/engine/blob/main/CONTRIBUTING.md#style