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Add master channel to performance issue template (#32345)

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I helped the daily mail debug a performance issue on I/O yesterday. Not
using the master branch could be wasting a lot of time due to old bugs.
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11
.github/ISSUE_TEMPLATE/performance.md vendored
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@ -28,10 +28,15 @@ assignees: ''
2. Please attach a small application (ideally just one main.dart file) that
reproduces the problem. You could use https://gist.github.com/ for this.
3. Run this app on a physical device using profile mode with Skia tracing
enabled, as follows:
3. Switch flutter to master channel and run this app on a physical device
using profile mode with Skia tracing enabled, as follows:
flutter channel master
flutter run --profile --trace-skia
Press ‘P’ to enable the performance overlay.
Then press ‘P’ to enable the performance overlay.
The bleeding edge master channel is encouraged here because Flutter is
constantly fixing bugs and improving its performance. Your problem in an
older Flutter version may have already been solved in the master channel.
4. Record a video of the performance issue using another phone so we
can have an intuitive understanding of what happened. Don’t use