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 72c28f3a01, but
rolled back in d539abd7c5 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 1a7ca91e39, and reverted in
79b9bdbbf4 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.
dc4ecd943b