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This change allows for users to open an instance of the DevTools Widget Inspector within a web view embedded in the widget previewer. This will allow for developers to inspect their previews without requiring IDEs to create a special debug session for the widget previewer application. DWDS is also rolled as part of this change to add DDS and DevTools support for the `web-server` device. Fixes https://github.com/flutter/flutter/issues/166423 **Demo:** https://github.com/user-attachments/assets/3e3a1098-0526-4c7f-8087-38fb84f28335
Integration tests
These tests are not hermetic, and use the actual Flutter SDK. While
they don't require actual devices, they run flutter_tester to test
Dart VM and Flutter integration.
Use this command to run (from the flutter_tools directory):
../../bin/cache/dart-sdk/bin/dart run test test/integration.shard
You need to have downloaded the Dart SDK in your Flutter clone for this
to work. Running ../../bin/flutter will automatically download it.
Coverage exclusion
These tests are expensive to run and do not give meaningful coverage
information for the flutter tool (since they are black-box tests that
run the tool as a subprocess, rather than being unit tests). For this
reason, they are in a separate shard when running on continuous
integration and are not run when calculating coverage.
Adding new test files
When adding a new test file make sure that it ends with _test.dart, or else it will not be run.