Emit API-only summaries

pkg/dev_compiler/lib/src/compiler/code_generator.dart

 // Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
 
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 import 'dart:collection' show HashMap, HashSet;
 import 'dart:math' show min, max;
 
 import 'package:analyzer/analyzer.dart' hide ConstantEvaluator;
 import 'package:analyzer/dart/ast/ast.dart';
@@ skipping 199 matching lines @@
 
     summary_link
         .link(
             uriToUnit.keys.toSet(),
             (uri) => summaryData.linkedMap[uri],
             (uri) => summaryData.unlinkedMap[uri] ?? uriToUnit[uri],
             context.declaredVariables.get,
             true)
         .forEach(assembler.addLinkedLibrary);
 
-    return assembler.assemble().toBuffer();
+    var bundle = assembler.assemble();
+    // Preserve only API-level information in the summary.
+    bundle.flushInformative();
+    return bundle.toBuffer();
   }
 
   JS.Program _emitModule(List<CompilationUnit> compilationUnits) {
     if (_moduleItems.isNotEmpty) {
       throw new StateError('Can only call emitModule once.');
     }
 
     // Transform the AST to make coercions explicit.
     compilationUnits = CoercionReifier.reify(compilationUnits);
 
@@ skipping 5288 matching lines @@
 }
 
 bool isLibraryPrefix(Expression node) =>
     node is SimpleIdentifier && node.staticElement is PrefixElement;
 
 LibraryElement _getLibrary(AnalysisContext c, String uri) =>
     c.computeLibraryElement(c.sourceFactory.forUri(uri));
 
 bool _isDartRuntime(LibraryElement l) =>
     l.isInSdk && l.source.uri.toString() == 'dart:_runtime';