Convert FrameInfo and ImageSizesForFrame into extension types (#6979) #711

Job	Run time
flutter-prep / ubuntu-latest Flutter Prep	25s
flutter-prep / macos-latest Flutter Prep	1m 35s
benchmark-performance	6m 17s
Dart Code Metrics	2m 19s
benchmark-size	3m 49s
devtools_app integration-test integration_dart2js - flutter - shard 1/3	14m 54s
devtools_app integration-test integration_dart2js - flutter - shard 2/3	20m 20s
devtools_extensions integration-test integration_dart2js	10m 17s
macos goldens test_dart2js	11m 41s
main	4m 4s
devtools_app integration-test integration_dart2js - flutter - shard 3/3	23m 5s
devtools_app integration-test integration_dart2js - flutter-web - shard 1/2	13m 21s
build_ddc	3m 7s
devtools_app integration-test integration_dart2js - flutter-web - shard 2/2	16m 37s
devtools_app_shared test	2m 36s
build_dart2js	3m 5s
devtools_app integration-test integration_dart2js - dart-cli - shard 1/1	19m 54s
devtools_extensions test	2m 50s
test_ddc	7m 5s
devtools_shared test	2m 27s
test_dart2js	7m 47s
	2h 57m 35s

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