Add textScale(r) value to Flutter context #425

Job	Run time
android \| ubuntu-latest \| stable	1m 23s
android \| ubuntu-latest \| beta	1m 12s
cancel-previous-workflow	3s
linux \| ubuntu-latest \| stable	1m 43s
linux \| ubuntu-latest \| beta	1m 26s
ios \| macos-latest \| stable	1m 48s
macos \| macos-latest \| stable	1m 52s
windows \| windows-latest \| stable	2m 43s
windows \| windows-latest \| beta	2m 46s
analyze / analyze	2m 3s
analyze / cancel-previous-workflow	2s
analyze / package-analysis	1m 30s
	18m 31s

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