Pass entry points JSON files to front-end server #15180
Merged
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This is a preparation to enable new global type flow analysis in Dart 2 AOT. Global analysis needs entry points JSON files in order to enumerate Dart entry points.
These entry points JSON files are generated while building Flutter engine (flutter/engine#4725, flutter/engine#4734) and uploaded into the cloud as a part of platform/mode-specific artifacts (https://chromium-review.googlesource.com/c/chromium/tools/build/+/944519).
This change adds artifact declarations for entry points JSON files into Flutter tools and passes them to Dart 2 front-end server (which passes them to the global type flow analysis).