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Gary Qian c6d0a2117a Improve performance of performance overlay by caching. (flutter/engine#6225) 
Cache a SkSurface with previously drawn shapes so that we do not need to draw them again in future frames.

On Nexus 5X test device, old render time for just the overlay was 1.3ms-3.0ms and this version improves to 0.9ms-1.3ms running flutter gallery in profile mode.
2018-09-11 16:13:23 -07:00
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src/flutter
Improve performance of performance overlay by caching. (flutter/engine#6225)
2018-09-11 16:13:23 -07:00