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reload instead of computing it based on the source modification information. 2. Fix for failure in Unit test case https://github.com/dart-lang/sdk/issues/30322 3. Fix crash in test that was being skipped in https://github.com/dart-lang/sdk/issues/30109 and turn that test on. This CL is work towards completing issue https://github.com/dart-lang/sdk/issues/28051 R=aam@google.com Review-Url: https://codereview.chromium.org/2998983002 .