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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 2d530daeca438ca24562d290616c0aec5ab76b88, but rolled back in 0a6e415b60581ef7934032df20401da1fae9ea9f 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 Re-landed in d43d35347594c893687dec7402a525d83f57db10, and reverted in 459f722b86415da01386fe41f37bafa842f11ae8 after it appeared to regress the above two benchmarks. After recent changes to microtask execution order which fixed https://github.com/flutter/flutter/issues/9998, re-introducing this fix results in benchmark improvements to the above two benchmarks in local testing.