Description

Exposing an extra field for native stacktrace from PlatformException. This change would follow by further changes on Flutter Engine to give back native stacktrace information for both iOS&Android. This is essential for crash reporting, currently our client can only see the error message Instance of 'PlatformException' if the crash is coming from native platform.

Related Issues

Fixing the following devicelab test failures regarding the previous PR:
platform_views_scroll_perf_ios__timeline_summary
channels_integration_test_ios
channels_integration_test
channels_integration_test_win

Tests

I added the following tests:

flutter/test/services/message_codecs_test.dart

Checklist

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• I read the Contributor Guide and followed the process outlined there for submitting PRs.
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• I updated/added relevant documentation (doc comments with ///).
• All existing and new tests are passing.
• The analyzer (flutter analyze --flutter-repo) does not report any problems on my PR.
• I am willing to follow-up on review comments in a timely manner.

Breaking Change

Did any tests fail when you ran them? Please read Handling breaking changes.

• No, no existing tests failed, so this is not a breaking change.
• Yes, this is a breaking change. If not, delete the remainder of this section.
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