BlurStyle.outer causes the app to crash on real device

[ahmedkassem]

Describe the bug BlurStyle.outer causes the app to crash on real device

To Reproduce Steps to reproduce the behavior:

1. use the main.dart file in the example folder
2. Run the app on real device (N.B the app works fine on Genymotion emulator).
3. When clicking on the icon to change the BlurStyle and it is on the BlurStyle.outer, the app crashes

[ahmedkassem]

I/Choreographer( 6333): Skipped 38 frames! The application may be doing too much work on its main thread.

[RockerFlower]

MaskFilter's doc says A blur is an expensive operation and should therefore be used sparingly.

I will optimize the performance of widget. Thank you!

[matthewrice345]

After ~5 seconds of running in an iPhone 6s my app crashes even when not using a blur.

[zurie]

also crashes on a 6plus that I have laying around