Library dependencies server API updates (to pass package maps).

pkg/analysis_server/lib/src/services/dependencies/library_dependencies.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.
 
 library services.dependencies.library;
 
+import 'package:analyzer/file_system/file_system.dart';
 import 'package:analyzer/src/generated/element.dart';
 import 'package:analyzer/src/generated/engine.dart';
 import 'package:analyzer/src/generated/source.dart';
+import 'package:analyzer/src/generated/source_io.dart';
 
 class LibraryDependencyCollector {
 
   final Set<LibraryElement> _visitedLibraries = new Set<LibraryElement>();
   final Set<String> _dependencies = new Set<String>();
 
   final List<AnalysisContext> _contexts;
 
   LibraryDependencyCollector(this._contexts);
 
+  Map<String, String> calculatePackageMap() {
+    Map<String, String> map = new Map<String, String>();
+    for (AnalysisContext context in _contexts) {
+      Map<String, Folder> packageMap = context.sourceFactory.packageMap;
+      if (packageMap != null) {
+        packageMap.forEach(
+            (String name, Folder folder) => map.putIfAbsent(name, () => folder.path));
+      }
+    }
+    return map;
+  }
+
   Set<String> collectLibraryDependencies() {
     _contexts.forEach(
         (AnalysisContext context) =>
             context.librarySources.forEach(
                 (Source source) => _addDependencies(context.getLibraryElement(source))));
     return _dependencies;
   }
 
   void _addDependencies(LibraryElement libraryElement) {
     if (libraryElement == null) {
       return;
     }
     if (_visitedLibraries.add(libraryElement)) {
       for (CompilationUnitElement cu in libraryElement.units) {
         String path = cu.source.fullName;
         if (path != null) {
           _dependencies.add(path);
         }
       }
       libraryElement.imports.forEach(
           (ImportElement import) => _addDependencies(import.importedLibrary));
       libraryElement.exports.forEach(
           (ExportElement export) => _addDependencies(export.exportedLibrary));
     }
   }
 }