Implement 'Import Library' Quick Fix for project libraries using TopLevelDeclarationInSource.

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

Index: pkg/analyzer/lib/src/dart/analysis/top_level_declaration.dart
diff --git a/pkg/analyzer/lib/src/dart/analysis/top_level_declaration.dart b/pkg/analyzer/lib/src/dart/analysis/top_level_declaration.dart
index 20f5fc18cae39d0a199500226d94f76f9a29a55f..8f1d6403cc6be865e0e0d9531ca02f4ac65302d1 100644
--- a/pkg/analyzer/lib/src/dart/analysis/top_level_declaration.dart
+++ b/pkg/analyzer/lib/src/dart/analysis/top_level_declaration.dart
@@ -31,10 +31,15 @@ class TopLevelDeclarationInSource {
    */
   final TopLevelDeclaration declaration;
 
-  TopLevelDeclarationInSource(this.source, this.declaration);
+  /**
+   * Is `true` if the [declaration] is exported, not declared in the [source].
+   */
+  final bool isExported;
+
+  TopLevelDeclarationInSource(this.source, this.declaration, this.isExported);
 
   @override
-  String toString() => '($source, $declaration)';
+  String toString() => '($source, $declaration, $isExported)';
 }
 
 /**