Support for parsing native function bodies with Fasta.

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

Index: pkg/analyzer/lib/src/dart/analysis/file_state.dart
diff --git a/pkg/analyzer/lib/src/dart/analysis/file_state.dart b/pkg/analyzer/lib/src/dart/analysis/file_state.dart
index acca51444046871ee54c34084d1f6a24b223deb1..67894b115c57fce78a10b05167744cce2b977bc2 100644
--- a/pkg/analyzer/lib/src/dart/analysis/file_state.dart
+++ b/pkg/analyzer/lib/src/dart/analysis/file_state.dart
@@ -367,6 +367,7 @@ class FileState {
             new fasta.Scope.top(isModifiable: true),
             uri);
         var parser = new fasta.Parser(astBuilder);
+        astBuilder.parser = parser;
         parser.parseUnit(scanResult.tokens);
         var unit = astBuilder.pop() as CompilationUnit;