liyuqian a4a4fc0cd4 Improve perf overlay performance. (flutter/engine#5571) ...

1. Mark perf overlay path as volatile
2. Set sample_margin_width = 0 to get a bar graph instead of saw-tooth.

Previously, the perf overlay itself could be a significant performance
hit and that makes it difficult to profile flutter app.

2018-06-19 16:42:21 -07:00

..

src/flutter

Improve perf overlay performance. (flutter/engine#5571)

2018-06-19 16:42:21 -07:00