Always add the target library to the store.

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

Index: pkg/analyzer/lib/src/dart/analysis/analysis_impl.dart
diff --git a/pkg/analyzer/lib/src/dart/analysis/analysis_impl.dart b/pkg/analyzer/lib/src/dart/analysis/analysis_impl.dart
index 78f1a6a6099e51c7b4d65ca26bdb2072223fc544..8ce3234f1103ce52b754f3918edc00af41bbe7b0 100644
--- a/pkg/analyzer/lib/src/dart/analysis/analysis_impl.dart
+++ b/pkg/analyzer/lib/src/dart/analysis/analysis_impl.dart
@@ -288,17 +288,6 @@ class AnalyzerImpl {
 
   void _resolveFile(AnalysisContext analysisContext, FileState library,
       FileState file, CompilationUnit unit) {
-    if (!file.exists) {
-      Source source = file.source;
-      var unitElement = new CompilationUnitElementImpl(source.shortName);
-      var libraryElement = new LibraryElementImpl(analysisContext, null, -1, 0);
-      unitElement.source = source;
-      unitElement.librarySource = source;
-      libraryElement.definingCompilationUnit = unitElement;
-      unit.element = unitElement;
-      return;
-    }
-
     RecordingErrorListener errorListener = _getErrorListener(file);
 
     String libraryUri = library.uri.toString();