Add a debugging tool for inspecting the contents of a summary file.

pkg/analyzer/tool/summary/inspect.dart

+// Copyright (c) 2016, 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:io';
+
+import 'package:analyzer/src/summary/idl.dart';
+import 'package:analyzer/src/summary/inspect.dart';
+
+main(List<String> args) {
+  if (args.length != 1) {
+    print('Usage: inspect PATH');
+    exitCode = 1;
+    return;
+  }
+  String path = args[0];
+  List<int> bytes = new File(path).readAsBytesSync();
+  PackageBundle bundle = new PackageBundle.fromBuffer(bytes);
+  SummaryInspector inspector = new SummaryInspector();
+  print(inspector.dumpPackageBundle(bundle).join('\n'));
+}