Use iOS scale when computing render buffer size (#4171)
When checking whether render buffer size has changed, apply the device scale factor used to convert points to pixels to ensure we're not needlessly re-allocating render buffer storage. Adds trace + debug log to make this easier to detect in future. Originally introduced in 2d530dae, but rolled back in 0a6e415b to test whether it was responsible for regressions to flutter_gallery_ios__transition_perf benchmarks: * average_frame_build_time_millis * missed_frame_build_budget_count
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