App Size tab doesn't accept AOT snapshots
Open
observatory migration
observatory: missing core functionality
P2
screen: app size
- Dominant language
- Dart
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Description
When I compile a Dart program to an AOT snapshot:
```
$ dart compile aot-snapshot foo.dart
Generated foo.aot
```
I would expect to be able to analyze the snapshot using the App Size Tooling, which claims to support analysis of AOT snapshots. However, the file picker requires a JSON extension and uploading the AOT snapshot does nothing (no error, no change in UI indicating anything happened).
cc @rmacnak-google
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