Fine. Add tracking for all/requested children of LibraryElementImpl.

Change-Id: I3f24b25ab72e67b7241c71c0a032008eb12651e0
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/449066
Reviewed-by: Johnni Winther <[email protected]>
Commit-Queue: Konstantin Shcheglov <[email protected]>

Author: scheglov

pkg/analyzer/lib/src/dart/analysis/driver.dart

@@ -106,7 +106,7 @@ testFineAfterLibraryAnalyzerHook;
 // TODO(scheglov): Clean up the list of implicitly analyzed files.
 class AnalysisDriver {
   /// The version of data format, should be incremented on every format change.
-  static const int DATA_VERSION = 549;
+  static const int DATA_VERSION = 550;
 
   /// The number of exception contexts allowed to write. Once this field is
   /// zero, we stop writing any new exception contexts in this process.