flutter / flutter/devtools

Flutter DevTools Performance FPS is not correct

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P2 screen: performance
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Description

##### At the same time

##### Here is Android Studio frame info 51.2 fps
![DE3791E3-4E8D-468A-A33E-2879D80CA261](https://user-images.githubusercontent.com/688545/113239750-f45b8b80-92dd-11eb-8775-e9ee05e00549.png)

##### Here is web DevTools frame info 60 fps

![4C913C50-8034-4862-BEC8-E59FCA23DD91](https://user-images.githubusercontent.com/688545/113239942-4bf9f700-92de-11eb-8141-5ebac1b5ac4a.png)

On my mobile phone side,it's has Jank, so i think the web Flutter DevTools Performances is not correct ~

Flutter doctor

Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel stable, 2.0.3, on macOS 11.2.3 20D91 darwin-x64, locale zh-Hans-CN)
[!] Android toolchain - develop for Android devices (Android SDK version 30.0.3)
! Some Android licenses not accepted. To resolve this, run: flutter doctor --android-licenses
[✓] Xcode - develop for iOS and macOS
[✓] Chrome - develop for the web
[✓] Android Studio (version 4.1)
[✓] VS Code (version 1.54.1)
[✓] Connected device (2 available)

! Doctor found issues in 1 category.

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