SkImageFilters::Magnifier(srcRect, inset) is deprecated. These parameters do not provide enough information for the implementation to correctly respond to canvas transform or participate accurately in layer bounds planning.

A new SkImageFilters::Magnifier function is added that takes additional parameters: the outer lens bounds and the actual zoom amount (instead of inconsistently reconstructing the target zoom amount, which was the prior behavior). Additionally, the new factory accepts an SkSamplingOptions to control the sampling quality.